Here at DARAY, we prefer our customers to be as knowledgeable as we are about our products and the technologies we employ therein. We understand that sometimes we use (seemingly) odd terms native to the lighting industry that you may be unfamiliar with, such as; Colour Temperature, Lux, Dioptre! To prove to you that we aren’t just making these words up, you can find various guides within this Discovery Centre - designed to help you learn more about a specific term, and importantly, to discover how each feature would benefit a specific clinical application - enabling you to make an informed decision about which style of lighting or which specification of monitor is correct for you and your Department.

Colour Temperature

What is Colour Temperature?

The Colour Temperature of a light source is an important consideration for Surgical use.

Colours are conventionally expressed in Kelvin (K), a unit of measure based on the Kelvin scale.

Colours over 5,000K are higher on the Kelvin scale and are known as ‘cool’ colours, whilst colours of a lower value on the same scale are called ‘warm’ colours.

Visually, a higher value gives the appearance of ‘blueish-white’ - similar to a cold, stark, clinical setting (think: kitchen/supermarket lighting!) – this has been proven to increase productivity and visual acuity, keeping you alert and focused. These colours provide the Surgeon with the truest tissue colour rendition.

A value at the lower end of the scale gives an appearance of ‘warm’ tones (think: lighting for comfortable settings such as a living room/bedroom). For a Surgical application, a warmer tone is useful for accurate tissue differentiation, as the red values (R9) found in blood and tissues appear more pronounced.

Installation Services

We have our own carefully selected team of Installation Engineers, fully trained to offer the best service in new installations, refits, retrofits and servicing. Professional, courteous and punctual – our team provide the highest level of customer service, and with an intimate knowledge of our lighting products, they ensure that the right solution is installed to meet the unique requirements of your department.

Here at DARAY, we fully understand the negative impact of down-time within a clinical environment, that’s why we strive to work as quickly and as professionally as possible, with our installation methods carefully planned and designed for minimal disruption to the patients and staff. We will work closely with you during the quotation process to ensure that we can attend site on a day that best suits you.

In some cases, we may require a visit to your site beforehand, for the purpose of performing a site survey. For all installations, we will ask for you to complete in a Pre-Installation Questionnaire, or for a qualified person to complete it in on your behalf. This is so that we can best understand the building structure within the proposed location, and the optimum fixing methods, enabling us to plan ahead accordingly.

If you have an installation requirement, please just ask us and we will be happy to provide a quotation. Our quotes will always be fair, competitive, and inclusive of full installation, testing, commissioning, attendance to site, labour costs, and mileage surcharges. Any materials previously identified as required for the successful installation of the equipment are covered by this price.

Call us now on 0333 321 0971 to book your DARAY Engineer.

Installation Terms:

  • Unless otherwise stated, all quotes exclude installation. DARAY offer consultancy and guidance on our entire product catalogue. We also offer installation services with our lighting range. If you choose to opt out of our installation service, do not follow our guidance or our installation instructions; DARAY cannot be held responsible for the installation of the products detailed in your order. All installations should be conducted by trained and competent personnel following applicable standards and laws
  • Should these products be incorrectly installed, violate health & safety, or cause injury to a third party, the responsibility is with the installer. This includes without limitation; liability for loss of profits, use, product, production, increased cost of operation, spoilage of materials, or any and all other commercial or personal loss arising in connection with the use of DARAY products.
  • DARAY installation services require the completion of a Pre-Installation Questionnaire (PIQ). If the PIQ is not completed or if the information supplied is incorrect then the customer accepts responsibility for any resulting actions, including but not limited to, a failure to complete installation which may incur additional charges. Installation costs include full installation, testing and commissioning of the quantity of equipment as detailed on the specification, Attendance to site, labour costs, mileage surcharges and any materials previously identified as required for the successful installation are also covered. Any materials required that we did not have advance knowledge of will be charged accordingly. If any structural issues are found on site that prevent us from being able to install the equipment, it may be necessary to abort the visit until the issue is rectified. Any aborted visits will incur further charges.

Magnifying lights – Dioptre explained

Magnifying lamps are commonly used by podiatrists, dental clinics, dermatologists, paediatricians, jewellers, watch and electronics repair, industrial inspection, scientific research labs – also for general examination use in a clinical setting. They are considered an essential tool when working with inspection, precision assembly, or design. Lighted magnifying lamps offer you the ability to view small details effortlessly, and as a result, they are extremely helpful in preventing eye strain and reducing vision fatigue.

This guide will increase your understanding of DARAY’s LED Magnifying lamps and should help you decide if it best suits your intended application.

Why buy a magnifier with a built-in LED light?

Despite the many advances in the field of lighting, most workplace locations still suffer from poor and indirect lighting conditions. This lack of efficiency of light distribution can directly result in marginal viewing performance, so good lighting is always a crucial element to consider. A Magnifying lamp compensates for this with a pattern of LED modules arranged around the magnifying window, to illuminate the object being viewed. Whilst Halogen and Fluorescent light sources are available too, these are not as energy-efficient as LED technology, which also tend to last far longer and require no further maintenance, along with no requirement for bulb changes – saving further cost over the lifetime of the product and eradicating downtime.

What does the term 'Dioptre' actually mean?

You will often see the term ‘dioptre’ used when searching for a magnifier. This, quite simply, refers to the amount of curvature in the lens. The higher the dioptre value, the more powerful the magnification, and the greater curvature of the lens. The term ‘dioptre’ directly identifies the refractive capacity of a lens, which is different from the term ‘magnification’. Magnification is the degree to which the viewed object is enlarged, this is usually expressed by the symbol ‘x’, which denotes the viewed size of the object in relationship to its actual size. To find the magnification level, a simple calculation is used: Locate the ‘dioptre’ number of the product you are looking to find the magnification value of (for example, the DARAY MAG700 is available in 3, 6, and 12 Dioptre options), divide that number by 4, then add 1. I will show this calculation using a 12-Dioptre lens: 12/4 + 1 = 4x. The 4x magnification value found equates to a 400% enlargement of the viewed object. To ascertain which ‘dioptre’ lens you should be purchasing, you are not just considering how ‘large’ you want the object to appear in the viewing window, you also have to take into account the focal length..

So, what does focal length mean?

The term ‘dioptre’ as described above has a direct correlation with the focal length. This is a measurement of the distance between the lens and the object, to the point where the object remains in focus to the user. Consider the fact that most uses for a magnifying light require space above the object and below the lens to work, typically with hands/tools. Consider what happens when shining a torch onto a wall – you reduce the distance (focal length) when you move the torch (magnifier) closer to the wall. In turn, moving away from the wall has the opposite effect, and the distance (focal length) increases. The higher the magnification of your chosen lens, the shorter the focal length, meaning you would need to have the object closer to the lens to achieve focus, thereby reducing the space in which you have available to work between the lens and the object. If little space is required, you will benefit from a higher magnification – these high-powered lenses are usually reserved for very close inspection and minute measurements. Requiring lots of space to work between the lens and object, such as for fiddly tools and complex procedures, means you will need to purchase a lower magnification, allowing greater focal length (space in which to work). To sum up the above, with a higher magnification/dioptre value, the focal length and field of view (FOV) within the lens become smaller.

Equivalent to…
Size increase of viewed object…
2 1.5x 150%
3 1.75x 175%
4 2x 200%
5 2.25 225%
6 2.5x 250%
7 2.75x 275%
8 3x 300%
9 3.25x 325%
10 3.5x 350%
11 3.75x 375%
12 4x 400%

2 pence As viewed in original size with the naked eye

2 pence 1.75x or 175% of the original size, observed through a 3 Dioptre lens

2 pence 2.5x or 250% of the original size, observed through a 6 Dioptre lens

2 pence 4x or 400% of the original size, observed through a 12 Dioptre lens

What is 'Field-Of-View' (FOV)?

The field of view is the size of the magnified area that is in focus under the lens. The lens actually remains the same size, however due to the increased curvature of the lens in line with a higher magnification (dioptre), the field of view diminishes accordingly. To refer back to our torch analogy from above, consider that as you move the torch closer to the wall (higher dioptre value/stronger magnification/reduced focal length), the spot of light on the wall from the torch becomes smaller (field of view).

Any other benefits?

Our magnification lamps are mounted on a set of spring-balanced arms, which, in turn, would be coupled with one of a variety of mounting choices that we have available – such as a wall bracket, or a desk clamp, among others. A major benefit of having the magnifying lamp mounted to a surface is that it offers you the freedom of being able to use both hands within your work, whilst continuously viewing the object under magnification. In most applications, the benefit of hands-free operation is vital and boosts productivity.

Tips for best use

  1. Similar to how you would use a pair of prescription glasses, ensure to use both eyes when viewing objects via a magnifier. If you are new to using a magnifier within your work, you may struggle to focus your vision for a few moments, do not worry - this is just because your eyes are adjusting to the increased amount of light they are receiving from the lens.
  2. Always maintain good posture for best results, and if need be, adjust the position of your working surface or the height of your chair. Another benefit of having the magnifying light mounted on a set of manoeuvrable arms is that you can position the lens exactly where it is needed, and to assist you in avoiding bad habits such as leaning too far into, or away from, the lens.
  3. Keep your eyes at a steady distance of approximately 8 – 10” from the lens. At this distance you will experience the least distortion of the image.

Choosing the Correct Loupes

The best method to evaluate loupes is to look at an object with straight black lines, as below Fig.A. The most common sign of poor quality loupes are low resolution, chromatic aberration and spherical aberration.

Resolution is defined as an optical system's ability to form distinguishable images of objects separated by small distances, or to recognize fine detail. When comparing different loupes, look at the testing objects and select an area of tiny detail that can only be seen with magnification.

Chromatic aberration refers to colour distortion. Because each colour has a different wavelength, uncorrected optics causes the various wavelengths to focus at different points in space. The first colour that generally comes out of focus is blue. When looking at black lines on white paper; poor quality loupes will display a blue haze just to the side of the black lines, as depicted in Fig.B.

Spherical aberration refers to the flatness of the image. When viewed through loupes, an object that exhibits spherical aberrations would appear to be curved or spherical, as depicted in Fig. B. The lines would not appear straight, as in the original Fig. A.

Viewing colourful or complex objects such as anatomical models or the inside of your hand does not give you the opportunity to evaluate loupes for their true optical performance, as most people are not trained to see the differences on such complex images. A simple piece of graph paper, however, can reveal the difference between mediocre and high quality loupes.

Other important considerations are light transmission, depth of field and field of view.

Light transmission is important not only for quality of the image, but also for the comfort and safety of your patients. Optimized light transmission means that you can work with less light, reducing your eyestrain while minimizing the exposure of your patient to bright light.

Depth of field is defined as the range that's in focus away from and towards you without moving your head. The ergonomic benefits, or how comfortable the loupes are to wear, of a large depth of field are clear because there is less need to move your back and neck to work effectively.

Field of view refers to the amount of the original object that you can see at one time. Different applications have different needs. A bigger field of view is not always the better choice; for instance, an endodontist might prefer to see only the area of focus, whereas a periodontist would like to see as much of the surrounding area as possible. Side-by-side comparison is the best method to choose the loupes that are right for you. We are confident that when you look into loupes from us, you'll see why we say the difference is clear.

Below, you will find a table offering a general guide to the specific Loupes that should be used, for a variety of clinical applications. If the intended application is not listed, please use your knowledge of the complexity and intricacy of the operation to find the best fit, based on the following examples of commonly used and recommended magnification levels: NOTE: This table is to be used as a guide only.

Which strength Loupes should I be using?

Discipline Key Body Size
Up to 1.75m 1.75m - 1.95m Over 1.95m
Opthalmology Magnification 2.5x - 3.5x 2.5x - 3.5x 2.5x - 3.5x
Focal Length 300 - 400mm 400 - 460mm 460 - 520mm
Cardiac Surgery Magnification 3.0x - 3.5x 3.0x - 3.5x 3.0x - 3.5x
Focal Length 400 - 460mm 420 - 460mm 460 - 500mm
Surgery (general) Magnification 2.0x - 3.2x 2.0x - 3.2x 2.0x - 3.2x
Focal Length 400 - 460mm 420 - 460mm 460 - 520mm
Oral & Maxillofacial Surgery Magnification 3.0x - 3.5x 3.0x - 3.5x 3.0x - 3.5x
Focal Length 340 - 400mm 400 - 460mm 420 - 500mm
Nerve/Tendon Surgery Magnification 4.0x - 5.5x 4.0x - 5.5x 4.0x - 5.5x
Focal Length 340 - 400mm 400 - 460mm 460 - 500mm
Neurosurgery Magnification 2.5x - 3.5x 2.5x - 3.5x 2.5x - 3.5x
Focal Length 400 - 460mm 420 - 460mm 420 - 520mm
Orthopedics (standing) Magnification 2.5x - 3.5x 2.5x - 3.5x 2.5x - 3.5x
Focal Length 400 - 460mm 420 - 460mm 420 - 520mm
Orthopedics (seated) Magnification 2.5x - 3.5x 2.5x - 3.5x 2.5x - 3.5x
Focal Length 340 - 400mm 400 - 460mm 460 - 520mm
Plastic Surgery (standing) Magnification 3.0x - 3.5x 3.0x - 3.5x 3.0x - 3.5x
Focal Length 400 - 460mm 420 - 460mm 460 - 520mm
Plastic Surgery (seated) Magnification 3.0x - 3.5x 3.0x - 3.5x 3.0x - 3.5x
Focal Length 340 - 400mm 400 - 460mm 460 - 520mm
Urology Magnification 2.5x - 3.5x 2.5x - 3.5x 2.5x - 3.5x
Focal Length 400 - 460mm 420 - 460mm 460 - 520mm
Vascular Surgery Magnification 3.5x - 5.5x 3.5x - 5.5x 3.5x - 5.5x
Focal Length 340 - 400mm 400 - 460mm 460 - 500mm
General Dentistry Magnification 2.5x - 3.2x 2.5x - 3.2x 2.5x - 3.2x
Focal Length 250 - 340mm 340 - 400mm 400 - 520mm
Endodontology Magnification 2.5x - 4.5x 2.5x - 4.5x 2.5x - 4.5x
Focal Length 400 - 460mm 420 - 460mm 460 - 520mm

LED Technology – How does it benefit you?

DARAY’s LED Examination and Surgical lighting range is the perfect choice for value and performance. Our LED lights have been developed to replace Halogen completely, saving you time, money - and importantly - diminishing your carbon footprint.

LEDs (light emitting diodes) have been around for a long time. Recently this technology has become leading-edge in the field of lighting - a breakthrough technological solution to the inherent problems of the incandescent light bulb. We have taken the technology and developed it further to provide high definition lighting solutions with no infrared, high brightness, low environmental impact, low power consumption, no toxic chemicals and a long operating life.

Here are the main benefits you can expect from switching your old Halogen lights to LED:

1. Long Lifespan

A core benefit of LED lighting is the lifespan of the LED bulb/module. With most of our lighting products, you can expect a life of approximately 50,000 hours. Let’s say the light is in use for 5 hours a day, that’s roughly 20-25 years of use from the LED light engine without ever needing to change the bulb – thereby reducing waste by 95% over the lifetime of the product.

2. Energy and Cost Efficiency

LED lights have an approximate energy efficiency of around 85-90%. This means that, of the total electrical energy used, 85% is used to actually produce light, with the remaining 15% being lost and converted into heat (still only producing a 2°c increase).

By comparison, a Halogen or an Incandescent light bulb has an efficiency of only 20% - meaning that a whopping 80% of the total electrical energy used is lost and converted into heat! Say if you were to have an electricity bill of £100 for lighting, then £80 of it was spent on lost energy. By making the switch to LED systems throughout, that same bill would sit at around £15 – saving you £85. Apply those maths to the average electrical bill for lighting only, for just one hospital, and you’re talking huge savings.

It’s not just the task lights such as the ones you use for Examinations and Surgery that you can switch, also consider all of the other types around you; Room lighting, reading lights, corridor lighting, car parks, headlights, streetlamps, etc. The more efficient you become on a larger scale, the more you can multiply those savings. Consider also, as discussed above, the savings made on the long lifespan of the bulb – further adding to the kitty and reducing wastage.

Consider for a moment, the extra funding available to a Hospital that has switched all of its lights to LED, and has therefore reduced its annual lighting bill by approximately 75-80%. Consider also what this money could be better spent on, perhaps towards providing much needed additional staff? Extra equipment? More efficient maintenance, and better quality of care for patients?

So, why waste it on producing unnecessary and harmful heat, gratuitous wastage and avoidable downtime.

3. Low Environmental Impact

LED lights, by nature, are free of all toxic chemicals. Most conventional lighting types commonly found in healthcare establishments, such a Fluorescent and Halogen bulbs contain a multitude of materials that are harmful to the environment, such as; Halogen, Mercury, Cadmium, Lead and CFCs

As well as containing no toxic chemicals, this type of light is also 100% recyclable – further helping you to reduce your carbon footprint by a huge leap. The long operational lifespan discussed in the above section means also that just one light converted to LED can save material and production of 25 equivalent incandescent, fluorescent or halogen bulbs. Here’s to a greener future!

4. Zero Heat in the Beam/Zero UV Emissions

Illumination by LED light produces absolutely no UV (Ultraviolet) emissions, and very little infrared light.

As a result, the very low radiated heat emission of LED lighting makes them highly suitable in a clinical environment, for illumination of both humans and animals, due to our UV-sensitive skin and delicate eyes.

5. Increased Visual Acuity

It remains a scientific fact that using LED lighting enhances your visual acuity – reducing eye strain among surgeons, headaches and fatigue. This works because an LED source delivers more ‘usable’ light to your retina, in part due to the high brightness and more natural Colour Temperature, essentially decreasing the amount of work that your eyes and brain have to do to distinguish one object from another. This helps contribute to, among other things, increased mental focus, faster responses, and reduced anxiety.

The superior Colour Rendering assists further, by allowing you to greater differentiate between tissue colours and tones. (see Colour Spectrum Explained)

6. Dispersal of Light

Our lights feature a strong beam of light with an even intensity across the entire area for clearer viewing and reduced eye strain. Halogen type lights, for example, make use of a mirrored reflector to help disperse the beam. These reflectors are covered with a dichroic filter, which can become stained over time with the high heat levels it is exposed to with constant use, thereby reducing the actual light output long before the bulb has reached the end of its life.

LED lighting, on the other hand, has no reflector and is designed to focus its light beam, achieving a much higher efficiency to the viewed area than other types of light. DARAY spend a lot of time on research and development of our lighting systems to ensure that they are able deliver the required amount of light to the subject far more efficiently.

7. Flexibility of Design

The lighting products in our range that are intended for Medical use, are designed with a circular light patch to match the intended clinical application on the human body. Our Dental lights produce a rectangular light patch, as required for Oral Surgery. This limits the emitted light to the mouth area only and away from the eye area, ensuring ultimate patient comfortability.

Some of our lights have a higher or lower fixed Colour Temperature than others (see Colour Temperature Explained within the Discovery Centre), and some with adjustable levels. All models (except for the X100 model) have variable intensity functions, for dimming the light.

We are able to do this because the technology behind LEDs allows for many different combinations of effect, enabling us to tune them to very specific levels for varying applications.

8. Safety

With a temperature raise on the surface of only 2°C, the risks of a patient or user burning themselves on a hot light bulb are entirely eradicated. All of our LED lights utilise a low voltage power supply, and the light fittings adhere to the anti-ligature requirements of the NHS.

Achieving 100% recyclable lighting within the UK’s Healthcare system is a lofty goal, however with a harsh environmental climate being realised far more so for future generations than our own, we all have a responsibility to reduce our environmental impact and adapt our procedures and equipment accordingly. The cost savings and efficiency increases seen when making The Switch, are simply added bonuses.

Our efforts to encourage LED solutions within the clinical workplace, and to provide further innovation within the lighting industry are making a big difference – one location at a time. That’s why DARAY are proud to be known as the UK’s most recognisable Medical Lighting manufacturer.

International Plug Types

To assist our customers outside of the United Kingdom, we can supply a full range of adaptors for all of our products, and for all International plug types. Whilst placing an order, your Account Manager will discuss with you which plug type you require, and we will endeavour to cater to your needs.

Please view the below guide, and advise us which of the following types* you would like us to supply with your order.

If you are unsure, or if you cannot recognise the appropriate socket from the below images, please follow the link here to find a list of the plug types and voltages as sorted by country, as provided by World

*If choosing types A or C, please also select an alternative compatible type, as some of our products will require the plug to be grounded.