On Wed, 2009-11-18 at 18:44 -0700, YES NOPE9 wrote: > To be "white" is one required to include all wavelengths of light from > infrared to ultraviolet ? I am not sure what that means. > Or does one just hit the high points of the cone cells ? That depends on how you define "white". To the human eye, justing hitting the high points usually looks pretty white. TTYL -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist