LED"S used by nasa have an almost perfect par rating.. dont get hot because the plants are asorbing all the photons.I want one really bad unfortunately I dont have nasa's budget.. these babies are about $30,000 apiece. These lights also have crap for lumens but grow plants better than the best hps. The have about 30 lumens. YEP 30!
check them out here:
http://www.quantumdev.com/LED_Produc...snap-lite.html
and here
http://216.239.39.100/search?q=cache...n&ie=UTF-8</a>
yeah you want to learn some fringe plant techniques and some arcaic growing info.. nasa is the place to go..as interplantary travel will require us growing our own food.. and you want to limit the power consumtion.. heat...and you want the plants to grow as effienctly as possible. NASA is a great source of horticulture info. update... why cant i post images??