I just switched to this one on the recommendation of another reefer in a different post about lighting a fuge. My caulerpa is definitely growing every day noticeably.
http://www.ebay.com/itm/121334978054?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Thanks for the tip alb_56 I went ahead and ordered one................http://www.ebay.com/itm/121334978054?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
If you are just trying to grow algae, the red/blue LED lamps work really well. If you think you'd use the fuge for inverts or fish then I'd go with a 5000 - 6500K LED. None of the algae's you'd want to grow are all that particular about lighting. Growth problems almost always come down to nutrient issues.
I was using one of thesse, but need to get a new bulb......justs wondering if i should just get a new setup ....http://lightsofamerica.com/en/Products/9266.aspx