It's a HPS Bulb, it's just dual spectrum and has more blue spectrum in it. It's a good way to go if your ballast doesn't run both HPS and MH bulbs.
Dub
OTE=Bigby;4327276]Thanks man, very pleased with the way things have been going so far. And all the best with the finish to your grow, fingers crossed for no problems and plenty of herb
Oh and one final thing, ive actually got them under one of these - Sunmaster dual spectrum lamp 400w - not hps,still 'HID' though. I just decided that as there isnt any distinct stages to the auto flowers life, that I wanted a combination light. Seems to be working ok.
[/QUOTE]