This page is the result of the discussion that started on the apertus forums: http://www.apertus.org/forums/viewtopic.php?f=4&t=662
Currently it is a collection of information required to actually build one of these.
As always with DIY products that use electricity: be careful - don't kill yourself or your cast and crew - hands off if you don't know what you are doing!
Tubes that some DIY cinematographers are already using:
These cost around 6 - 20€ each and are easy to source locally.
Dulux L lamps are specially designed for television studio lighting. They provide high lumen packages and offer excellent color stability, even when dimmed down to 50%. The special phosphor allow them to seamlessly blend in with the light from other tungsten (warm) or metal halide (daylight) lamps on the set. The first number (in 930 & 954) is the color rendition level. 9 = 90%+ color rendition fidelity (see http://en.wikipedia.org/wiki/Fluorescent_lamp#Color_rendering_index). Kino were the first to manufacture tubes with this 95+% color rendition fidelity which might be even better than the one by Osram outlined here. Note that you can buy those kinoflo tubes "spare part" also, in the same price range (http://www.filmandvideolighting.com/2ft55tub6pac.html) - though we do not know if the Kinoflo ballast treats the tubes in a special way that enables/improves their performance.
Everyone talks about LEDs recently and how they are going to replace traditional light bulbs.
But lets take a look at the facts:
The luminous coefficient is luminous efficiency expressed as a value between zero and one, with one corresponding to an efficacy of 683 lm/W.
So the maximum physically possible output of one Watt of electric power are 683 Lumens of light. Depending on this efficiency the rest of energy is converted to heat rather than photons/light.
|Lamp Type||Luminous Coefficient|
|Tungsten Incandescent Bulb||2 - 3%|
|Tungsten Halogen||2.5 - 3.5%|
|LED||0.7 - 15%|
|Flourescent Tube||9 - 15%|
|HMI||9.5 – 17%|
So Flourescent Tubes are just as energy efficient as LEDs and have been around for quite some time already.