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Flourescent Tubes and their History!

There is some misunderstanding in the industry regarding the Colour Temperature (CT) of fluorescent lamps used in script lights. The notional CT of "Northlight" is 6,500° Kelvin, which would obviously be the preferred CT for a script light tube. Unfortunately this is not the end of the story.

The second parameter that needs to be taken into account is the Colour Rendering Index (CRI). This is a measure of the light quality that allows the eye to resolve slight differences in colour. A high CRI gives good resolution and vice-versa. More information is shown in Fig. 2 below.

The third parameter is cost. The nearer a tube gets to a CT of 6,500°K or a CRI of 100%, the more expensive it is. This is because the tubes need to be hand selected. Some tubes being supplied may be the correct CT but they will have a low CRI which could cause problems in critical applications.

The tubes supplied by Bryant Unlimited have a CT of 6,000°K and a CRI of 80% - 90% (CRI group 1B), which we feel is a good compromise between the three parameters.

Fluorescent Tubes


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