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General Information & Frequently Asked Questions

Why is daylight so good for you?

With full spectrum Daylight technology, your eyes will still be fresh at the end of the day! No headaches, no red-eyes, working under daylight is as relaxing and natural as a walk in the park.

Daylight colours: Love colours just the way they are! Our daylight technology not only reduces eye-strain; it also gives you the best colour matching ever.

Energy saving: All Daylight bulbs and tubes use 80% less energy and last 10X longer. When you work with your lamp, you reduce your electricity bill and do your bit for the planet.

Low heat: Even if you touch the shade or tube of this lamp by accident, you will be safe. All our bulbs and tubes use the daylight low heat technology for ultimate comfort and safety.

How Compact Fluorescent Bulbs & Tubes work?

Unlike traditional filament bulbs, compact fluorescent bulbs & tubes do not rely on a metal filament to create light. The majority of the light output is generated from a phosphor coating by the process of fluorescence.

A CFL consists of a sealed glass tube with a heating cathode at each end. The inside of the glass tube is coated with a phosphor powder (by changing the colour of the powder it is possible to get different colour light from the tube, such as warm light and da

To light the tube a current is passed through the heating cathodes for a short time and then a large voltage is applied between the two cathodes. Electrons fly up and down the tube colliding with atoms of mercury vapour in the tube. This in turn excites the phosphor coating on the inside of the tube and light is produced!ylight).

The sealed tube consists of an inert gas such as argon or krypton at very low pressure (these gases are both found in the air around us) and a very small amount of mercury.An extremely small amount of cathode is used up each time the bulb or tube is switched on. Once the cathode is used up the tube will not light (this is seen as black sections at the end of the tube and often accompanied by flashing at either end). Once the tube has reached this state it should be replaced. The more times a fluorescent bulb or tube is switched on & off the shorter it's life will be.

In the past, when nearly everyone filled their homes with incandescent bulbs, brightness was measured in watts - which is actually a measure of power. Since the introduction of energy-saving bulbs, this is a less useful measure of brightness, as new bulbs use a lot less power to produce the same amount of light. So, instead, light output is measured in lumens. The higher the number of lumens, the brighter the light. Use this chart to see equivalent watt and lumen output for old-style incandescent and the three types of energy-saving bulbs (LEDs, halogens and CFLs). As a rough guide, around 400 lumens would be suitable for a bed-sized table lamp, whereas you might want between 1,500 and 3,000 lumens in total (from more than one bulb) for a good-sized living room. Now you have decided on how bright you want your bulbs, you need to decide on the colour of the light.

What is the difference between Lumens & Lux?Lumens,

This is also known as luminous flux, is the measure of the perceived power of light from a natural or artificial light source. In simple terms it is the measurement of how bright a bulb or tube is.Whether you are 1 meter away or 100 meters away from a light source it is still emitting the same amount of lumens.Lux is the measure of the apparent intensity of light hitting or passing through a surface at a given distance. A light source 1 meter away will have a far greater lux than if you were 10 meters away.

So in summary the difference between the units Lumen and Lux is that Lux takes into account the area over which the luminous flux is spread at a FIXED distance. Whereas Lumens is the amount of light coming from a light source irrespective of the distance.


Kelvin is the colour of the light as perceived by the human eye. It is measured in degrees Kelvin (°K). The colour temperature is derived from heating a block of carbon to the specified temperature and observing the colour it glows.

For example:
Temperature of around 2,500°K gives a Red/Orange colour. This is like Sunrise and sunset has a very warm feeling.
Temperature of around 10,000°K gives a Blue colour. This is like a Blue Sky has a very cool feeling.

In between the above extremes is the White Light we want to achieve (at around 6,000 to 6,500K). This is the colour temperature rating of our daylight Compact Fluorescent Bulbs & Tubes. The general terms used for artificial light colours are:

  1. Warm White (3,000K)
  2. Cool White (4,100K)
  3. daylight (6,500K) – This is what our bulbs & tubes are

What is the difference between Diopter and magnification?

Diopter refers to the curvature of the lens. As the diopter increases, the lens become thicker and the curvature greater. As the curvature increases, light rays are redirected to fill a greater portion of the viewer's retina which makes the object look bigger.

Magnification ( or Power )refers to how much larger an object is made to look through a magnifying lens. Power is typically indicated by an X such 2X or 4X.

There is more than one formula to converts the diopter of a lens into its power, we as a company use the common formula: Magnification = (Diopter / 4) +1

For example an 3 diopter lens makes an object look 75% times larger, over and above what the unaided eye already sees.

Common diopter/power

    DiopterMagnification% Bigger

Do fluorescent bulbs & tubes contain mercury?

Yes, each tube or bulb contains about 5 milligrams of mercury. But this is about equivalent to the amount of ink you get on the tip of a ball point pen.

For your information, a standard thermometer contains 100X the amount of mercury you can find in fluorescent bulbs & tubes.

Mercury is an essential component in the operation of fluorescent tubes and Compact Fluorescent Lamps

Mercury is an essential component in the operation of fluorescent tubes and Compact Fluorescent Lamps

Exposure to mercury should be avoided as it can harmful.

In tubes and bulbs the mercury is enclosed in the glass envelope so, in normal use, there is not any hazard to health.

The only time a customer could come into with mercury is if the glass of a fluorescent tube or bulb is broken. As the amount of mercury is very small the risks are extremely low. Any breakage should be cleaned up straight away and disposed of as you would with broken glass.

Consumer's are now starting to becoming aware that fluorescent tubes and bulbs contain mercury.

Clean-up instructions for broken fluorescent bulbs and tubes

If a fluorescent tube is broken it does not pose a health risk to anyone immediately exposed. As a precautionary measure the room should be ventilated and the bulb cleaned up and disposed of properly. The clean up should involve:

On hard surfaces wipe the area with a damp cloth, place that in a plastic bag and seal it. Sticky tape can be used to pick up small residual pieces or powder from soft furnishings and sealed in a plastic bag. The plastic bag does not need to be air tight but should be reasonably sturdy. Place it in another similar bag and seal that one as well in order to minimise cuts from broken glass.

Contact your local authority for advice on where to dispose of broken or intact CFLs and tubes as they should be treated as hazardous waste.

Advice on Re-cycling of daylight Products

A crossed out Wheelie Bin logo (**) If you're buying a new electrical item, we will recycle your old one for free

Why recycle?

Unwanted electrical equipment is the UKs fastest growing type of waste.

Many electrical items can be repaired or recycled, saving natural resources and the environment. If you do not recycle, electrical equipment will end up in landfill where hazardous substances will leak out and cause soil and water contamination – harming wildlife and also human health.

We can help

We are pleased to offer our customers the chance to recycle their old electrical items.

If you wish to return an item to us for free recycling under our retailer obligations the please contact Lumi Lighting on +44 (0)114 383 0454 when we will advise you on the procedure.

To remind you that old electrical equipment can be recycled, it is now marked with a crossed-out wheeled bin symbol. Please do not throw any electrical equipment (including those marked with the crossed out wheeled bin symbol) in your bin.

What is WEEE?

The Waste Electrical or Electronic Equipment (WEEE) Directive requires countries to maximise separate collection and environmentally friendly processing of these items. In the UK, distributors (including retailers) must provide a system which allows all customers buying new electrical equipment the opportunity to recycle their old items free of charge. Those establishing their own take-back scheme must as a minimum offer all customers buying new electrical equipment free take back of their old electricals on a like-for-like basis.

Find more information on WEEE recycling, and locate your local recycling centre, at

Find out more

  • Are you nightsafe?
  • Find out more about the Macular society?
  • Improving low vision conditions with daylight lighting
  • Lumie for SAD find out more.