400 w mh 10k bulb
400 w mh 20k bulb
400 w mh 55k bulb:(
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400 w mh 10k bulb
400 w mh 20k bulb
400 w mh 55k bulb:(
is there even a difference at all ... the 55k one http://www.esuweb.com/products/243Co...500_KELVIN.htm..... is colored how would that thing go ....who thinks what .
Hmmm, well it says full spectrum, so if your not planning on getting a HPS for flowering, id go for that last one that yellow.