Originally Posted by Chad B
Dimmers won't work with fluorescent bulbs like the ones in the Idealume.
Make sure the wall behind your TV is a neutral white, gray, or black if possible, because even if you have a perfect light if you bounce it off a colored wall a good bit of the trouble you went to to get the color calibrated bulb will be wasted.
Conventional light dimmers don't work right with fluorescents. They typically cause flicker. Special ballasts are required to correctly dim fluorescent lamps and they are very expensive. Special dimming controls are also required to operate the dimming ballasts. They are very expensive as well.
Black isn't recommended with or without bias lighting. It's difficult to illuminate black sufficiently. When viewed with room lighting, a black surround diminishes perceived contrast of the image on the screen. A neutral white or neutral gray wall preserves correct color perception of the image on the screen. This principle also helps when using full room lighting. This technical article explains why this is important: 'The Importance Of Viewing Environment Conditions In A Reference Display System
There are T8 lamps (eight eighths of an inch in diameter) available from lighting suppliers, with a color rendering index (CRI) of 98 out of 100. The appropriate fixtures are not too difficult to find, either. Some method will need to be devised to shutter the illumination down as needed to provide illumination off the wall, so that it is 10% of the peak white of the TV, once the picture controls are adjusted for dark room conditions.
A "perfect" solution is not available. Achieving a near ideal solution typically requires thoroughly understanding the principles of the technique, time, effort, the right materials, and a modest amount of experimentation. The closest lamp to the practical ideal for bias lighting is the T12, seven phosphor, D65 lamp my company uses in our professional product. Even then, we incorporate color correction in the product to approach the correct white point for video. T12 fixtures of the right size are not nearly as common as T8.
Best regards and beautiful pictures,
G. Alan Brown, President
A Lion AV Consultants affiliate
"Advancing the art and science of electronic imaging"