What are Loyalty Points?

If you create an account with www.craftlamps.co.uk everytime you make a purchase one loyalty point will be added to your account for every whole pound you spend excluding any P&P charges that may apply.

Loyalty points are worth an equivalent to £0.05 when used against any future purchases at www.craftlamps.co.uk.

Loyalty Points have no cash value and are non transferable.

You must be logged in to your account in order to redeem your Loyalty Points.

 

What do the icons mean on the Bulbs and tubes?

Power Consumption Rated power The rated power consumption of the tube or bulb in watts.
Light output in Lumens Brightnes The brightnes of the bulb in Lumens. What are Lumens?
Colour Temperature in degrees Kelvin Colour Temperature The colour temperature of the bulb in degress Kelvin. What is Colour Temperature?
Bulb or tube connector type End Cap The end cap or connector on the bulb.
Colour rendering index CRI CRI The Colour Rendering Index of the bulb. What is Colour Rendering Index (CRI)?
Is it dimmable Dimmable? Is it dimmable or not?
Estimated Lifespan Lifespan The maximum rated lifespan of the bulb (N.B. this is not a guarantee of how long it will last).
Dimensions Dimensions The dimensions of the bulb.
Mercury content Mercury Content How much mercury the bulb contains if quoted by the manufacturer.

All information is taken from the manufacturers technical data. If it states "Not Specified" it means that the manufacturer has not made that information available to us.

 

What is Diopter?

Diopter refers to the curvature of a magnifying lens. As the diopter increases, the curvature becomes greater. As the curvature increases, light rays are redirected to fill a greater portion of the viewer's retina. Put simply, the bigger the diopter the bigger the object will look when viewed through the lens.

Diopter affects the Magnification power of the lens.

 

What is Magnification Power?

Power refers to how much larger an object looks through a magnifying lens. Power is typically indicated by an "X" such as 2X (2 times) or 4X (4 times). The common formula to convert the diopter of a lens into its Magnification Power is to divide the diopter number by 4 and add 1.

Common diopter/power relationships

Diopter Power % Bigger than original object
3 1.75X 75%
5 2.25X 125%
8 3.00X 200%
11 3.75X 275%
13 4.25X 325%
16 5.00X 400%

 

What is Colour Temperature (Degrees Kelvin °K)?

Colour Temperature refers to the colour variation of light (the colour of the light) and is measured in degrees Kelvin. In lighting this scale ranges from the flame of a candle at around 2,000°K to deep blue sky at around 10,000°K.

In simple, and a bit confusing, terms the colour a bulb emits is "warmer" (red/yellow) at low temperatures and "colder" (blue) at high temperatures and white (daylight) in the middle.

For a bulb or tube to be classified as "daylight" it will have a colour temperature of between 4,000°K and 7,000°K.

It is commonly accepted that a colour temp of 5,000°K to 6,500°K gives the closest reproduction of natural sunlight.

A standard bulb you would buy for everyday use is around 2,700°K.

 

What is Colour Rendering Index (CRI)?

This is how colours appear under a light source. Natural sunlight has a CRI of 100, this displays all colours perfectly.

It is best to have an artificial light source with a CRI of 80 or more for task lighting.

 

What are Lumens?

Lumens (lm) are the measurement of the total amount of "visible" light from a bulb or tube. The higher the number of lumens the more the light output. The amount of lumens emitted by a light source (bulb) is determined by the wattage of the bulb and the lighting technology used.

Lumens represents the true brightness of a light bulb and not the wattage of a bulb.

The light from an incandescent bulb is produced by an electrical charge in the metal filament inside the bulb. This produces both light and a lot of heat.

Fluorescent bulbs and tubes are more efficient as their light source does not rely on the heating of a filament. Therefore these bulbs are both low heat and low energy. The light from a fluorescent bulb or tube is produced from a series of reactions between different elements, primarily phosphor.

New LED lights are even more effeicient at converting the energy into light.

New E.U. regulations are coming into effect so that all light bulbs and LED light fittings will need to show their Lumen output. This can be very confusing as we are used to buying a bulb based on its wattage, more watts means more light. This still is, as a general rule, correct. The difference now is the efficiency of modern light bulbs to produce light. This is measured in Lumens per watt. A traditional incandescent bulb provides between 10 to 17 Lumens per watt, therefore a 100 watt bulb will give between 1,000 Lumens to 1,700 Lumens. A compact flourescent bulb provides between 40 to 70 Lumens per watt. This means that a compact flourescent bulb of between 14 watts and 25 watts can provide enough light output to be equivalent to a traditional 100 watt bulb depending on its effeciency.

This all can still be confusing so as a very general rule of thumb when buying a compact flourescent bulb if it states an output of 1,000 Lumens or an input wattage of 20 watts it is roughly equivalent to a 100 watt bulb.

 

What is Lux?

Lux (lx) is the standard international unit of illuminance, lluminance is a measure of the intensity of visible light on a surface.

One lux (lx) is equal to one lumen (lm) per square metre.  1 lx = 1 lm/m2

As the source of the light is moved away from the surface the illuminance will go down as the area the light covers gets bigger. Therefore to provide the same Lux level over a larger area you will need to increase the light source (more Lumens).

To give you an idea of lighting levels office lighting is generally rated at 320-500 lx and full daylight (not in direct sunlight) is between 10,000 and 25,000 lx.

The amount of lux you will need for your work space will depend on how detailed the work is, how much time you spend performing the task and the level of contrast on the objects you are working with. This can vary greatly from around 750 lx to 20,000 lx. However for most work spaces a level between 1,000 lx and 3,000 lx is usually adequate.

 

What are the different types of end caps for bulbs and tubes?

 

Compact Flourescent Bulbs and LED Bulbs

Bayonet connector eddison screw small eddison screw small eddison screw

B22 or BC
This is the standard UK bayonet fitting and is approx 22mm diameter.

ES or E27
This is also known as the standard Eddison Screw and is approx. 27mm diamter.

SES or E15
This is a small Eddison Screw and is approx 15mm in diameter. It is also sometimes referred to as E14.

GU10
Commonly used in recessed lights, approx 10mm between pin centres.

 
G23 2Pin    
G9
Used in small light fittings, approx 9mm between pin centres,
G4
Used in small light fittings, approx 4mm between pin centres,
   

 

Fluorescent Tubes

G10Q 2G7 4Pin 2g 11 4pin GX10Q4t
G10q
This is the most common fitting for circular tubes.
2G7 4 pin
G7 refers to the distance between the pins. This ones is 7mm from center to centre.
2G11 4 pin
The distance between the pins is 11mm.
GX10q
A fitting generally used on multiple tube fittings usually 4 tubes.
 
G23 2Pin G23 2Pin Alt    
G23 2pin
Although both of these have the same code they have a different number of projections on the top of the sqaure block so it is importnat to check you have the correct one as otherwise they will not fit.
   

 

 

Straight Fluorescent Tubes

G5 G5 T2 G5 13Watt G5 18Watt
G5
This is a standrd straight fitting, 5mm between pin centres.
G5
A variation on a standard G5 end cap.
G5
A variation on a standard G5 end cap.
G5
A variation on a standard G5 end cap.
 
G5 PST27R

G13

   
G5
A variation on a standard G5 end cap.
G13
A larger standard end cap, 13mm between pin centres.
   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Why do I need Task Lighting?

People often say that they can read fine in the daytime but struggle at night when using artificial light. One of the common misconceptions is that they require a magnifying lamp to overcome this problem, actually all you need to do is try to replicate the light that you get during the day.

All Work Spaces Require Good Task Lighting, but what is good task lighting?

Good Task Lighting will:

  • Provide good strong light on the work area.
  • Show the true colour of the items.
  • Not interfere with your work.
  • Not cause glare.

How do Craft Lamps achieve this?

Provide good strong light on the work area.

To provide a good strength of light (this is measured in Lumens and is expressed as Lux) you need to position the light source as close to the working area as possible. Regardless of the power of the light source the amount of Lux will reduce the further the light source is away from the working area. Therefore if you are working on a large area or require the light source to be a long way away, due to the equipment you use or the space you work in, you will need a much more powerful light than if you can place the light source very close to the working area. We therefore provide a wide range of sizes and formats of lights to allow the best choice for your working environment.

Show the true colour of the items.

To show the true colour you need a light source that closely replicates natural daylight. To do this they require a colour temperature (this is measured in degrees Kelvin and is expressed as a capital “K”) that is between 4,000K and 6,500K. Normal light bulbs that are generally fitted into homes are 2,700K; this emits a reddish/yellow light which distorts the colours of the objects that we view.

Not interfere with your work.

So that the lamp does not interfere with your work, the lamp needs to be positioned so that it does not get in the way of your hands or tools whilst you are working, but minimising any shadows. We therefore have lamps with a selection of different fittings to allow them to be floor standing, table mounted or clamped on so that they can be positioned as close as possible but still stay out of your way. It is also important to consider the heat output of a lamp as this will also interfere with your comfort. All our lamps are low heat lamps as they either use fluorescent tubes or LED light sources.

Not cause glare.

Although you want as much light as possible (Lux) if the light is too powerful or not correctly shaded it can cause glare. This will cause eye strain which will reduce the amount of time you can comfortably work with the light. All the lights we sell are designed for task lighting, as opposed to decorative lighting, so are fitted with a shade designed to protect your eyes from the light source and direct the light where you need it, on your working area.

Do you work on very small items or do very fine or detailed work?

If you work on very small items good lighting may not be sufficient so you will then need to consider a magnifying Lamp. These provide a light source and a magnifier in one unit which will minimise shadows, provide a good strength of light on the work area as well as magnification. Remember that you can also use a magnifying lamp as just a lamp if you wish.

Lamp Style

Once you have considered all the technical stuff if the light is to be in a living area in your home you may also want to consider the style of the light to fit into your decor. This is a very personal thing but we do try to provide a wide choice so that hopefully we have one that suits your