I found an interesting option by Ecoxotic:
They have 48" 24W LED strips for $99 each, with several combinations of white, blue & magenta. Looking at their color chart (http://www.ecoxotic...._chipGraphs.pdf), it seems like a mixed blue/ magenta strip would cover all the good wavelengths for plants, closer to the chlorophyll absorption peaks mentioned by Adam (cca 430, 450, 630 and 660 nm).
Looking at page 4 of the Ecoxotic Stunner light manual (http://www.drsfoster...StripManual.pdf ), it seems that I can attach two of these 48" 24W strips to a single power supply. The power supply is $36.95 and a 2-way splitter is $7.95 (http://www.ecoxotic....ccessories.html ).
I noticed that Ecoxotic also offers reflectors to "double the light output" which are not very expensive and may be worth it. However I don't know if these reflectors address the possible spotlight effect commonly mentioned for LEDs, or possibly even make it worse. Anybody know?
So if I was to buy 2 Ecoxotic 48" Stunner LEDs strips (blue/magenta), 8 Ecoxotic 12" Stunner reflectors, + the transformer and 2-way splitter, I'm looking at an investment of $261.55 + tax & shipment (if I bought it from their website - I have seen the same items slightly cheaper on other websites).
Argh! Not as cheap as I was hoping, but I guess I just have to convince myself that it'll save me money in the long run on electricity bills and not having to switch out bulbs once a year.
Anyway, I appreciate any suggestions/correction to what I wrote above, before I make a decision...
Although I think I will end up going with the option above due to price, I did find another very interesting option:
I like how the LEDs are made into a T8 tube that can be put on a T8 fixture (although only their model it seems, not any T8 fixture). And there are even mixed fixtures for LEDs and T5s.
Has anybody tried these?
Edited by Fernando Rivadavia, 07 June 2012 - 18:21 PM.