Hi Anon,
from what I understand most all quality HID bulbs that are designed for growing are very similar as you can see by manufactures specifications, so as long as you go with a reputable dealer, I would shop by price
HIDHUT is very good, great coustomer service, if not the very lowest price ever
and on Ebay you can see how many sales the person has as well as the posts of each coustomer to make sure they are not shady....make sure they have been selling for some time and to many people
Just not alot of posts on bulb comparison and I never changed mine enough to really get to try alot of different brands when I used HPS
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