After a long discourse on the ADA list I discovered that my Phillips TL850 32w T-8 lamps compare favorably with the $32 ADA lamps. Check out the spectral spread at http://www.lighting.philips.com/nam/prodinfo/fluorescent/p3554.shtml the 850 (5000k) is the last colored chart. Big spikes at 425nm and 625nm locations, along with a wad of green for CRI. At about a 1000 lumens/watt they are very efficient, even for T-8s. I bought mine for about $5 per. CF and other T-8 info is at http://www.lighting.philips.com/nam/prodinfo/index_body_1.shtml. and specific 32w 4' info on the 850 is at http://www.lighting.philips.com/nam/prodinfo/fluorescent/p3008.shtml. Therefor the PAR is really good? BTW, I'm totally happy with them. Just a suggestion for anyone considering the moce to T-8s.