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so as not to have a totally dark room. Further they recommend this lamp to be a 6500K light. Anyone know where to find such a light?Thanks... Paul
Follow Ups:
This is true only when using an RPTV or a Direct View CRT.It is a terrible idea for FPTV ;-)
Regards,
Why is placing a lamp behind a FP reflective area (not the projector itself) a bad idea?If you place a lamp behind your screen you will bias your visual system to perceive dark greys to be black. By adjusting this lighting you can gain higher perceived black values than without.
Or did I misunderstand you?
Cheers,
HalcyonPS IMHO the above only applies if one calibrates the video chain properly and has an accurate enough dimmer/scale attached to the backlight for proper adjustments.
Halcyon,Assuming we're properly calibrated, I can think of a few reasons:
0) Any light source in the room would still get back onto the screen without all surfaces being completely absorbent. So now you've got some washed out coloration.
1) CRT projectors have no issues with black levels, so a bias light does nothing more than to decrease the apparent brightness level of a source that's already low output. So you get a decreased contrast ratio available by introducing ambient light.
2) Digital projectors generally have higher light outputs, and can utilize a gray screen to improve perceived black levels, without using a bias light. Once again reflections are the enemy, and you don't want any light getting reflected back into the screen.
Regards,
.
Try a Daylight 65 bulb (from Daylight). They are already set to put out 6500K light.
CinemaQuest Ideal-Lume Bias Light - Price: $44.95Or you should be able to pick up a flourescent light unit with a 6500K tube for about $12 at your local hardware store.
If you use fluorescent lighting along with slow refresh rate displays (less than 100 Hz) you will more than likely cause tiredness of eyes.This comes about from differing refresh rates of the image source and the fluorescent light source. It's better to have both sources at the same refresh rate or a multiple of each other to avoid tireing your eyes.
You can control the decay/refresh rates of the fluorescent lamp by picking the correct ballast type if my memory serves me well (it's been so many years since I last checked this). Be sure to check with a certified lighting engineer.
Cheers,
Halcyon
nt
Check out the back editions of Widescreen Review. They cover viewing environment in detail and recemmend several sources for the bulbs. The backlighting is used to "bias" the eye as the vieing are subtends less than a 30 degree angle (how much of the eye) is covered. Video Essentials also has a reference level for backlight in the setup section of the disk.
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