Steve Brust wrote: > Actually, it isn't all that complicated. _Principles of Field Crop > Production_ by Martin, Leonard, and Stamp, third edition, page 76 has a > very convenient chart showing how plants are effected by various light > spectra. Turns out "orange-red" is right up there; you don't lose very > much. Part of the reason that chlorophyll is green. It absorbs mostly orangish light, reflecting the rest. -- Frank Mayhar frank at exit.com http://www.exit.com/ Exit Consulting http://www.gpsclock.com/ http://www.exit.com/blog/frank/