photoluminescence

[sharp81]

Can anyone tell me any good websites which have information on photoluminescence?

Also, i have an lcd projector with a light source which has about 500 lumens as the light intensity.If i need to project an image of an chess board on the lcd onto the screen with the best contrast say for a 32 gray levels(5 bit) what shld be the distance to screen

[NoTime]

Room illumination is the main factor you need to determine.
Also what do you consider to be an acceptable contrast ratio.

[sharp81]

i am considering a contrast ratio of abt 20:1.i need some good material on this topic as i am very new to these.