Originally Posted by Itwasntme
micheljg: They are actually these http://www.jussinmaki.net/verkkokaup...2v-p-14487-73/
but there is nothing special to know.
Steve001, do you think its PAR what makes the difference? Unfortunately I cant get PARmeter. Is it possible that leds have more PAR/PUR than T8s but still "less powerful" to grow algae?
I think so. Sorry, that I can't be more helpful.