gives

I've already introduced myself. I would, however, like to tell you about my views/feelings on Facebook and messaging slang. I have called people 'stupid stoners' for posting outrageous dares (ie 'Tag a friend who could smoke all this in a day'), improper grammar and ridiculous slang (ie 'my bae...

what is it that gives the differences in effects?

Picture should be self explanatory.. What gives?

i am planning on upgrading light for a 3x3 area. I can't decide between the 700 or 900 will a 900 give me noticeably better yield? The 700 gives me 35 watts per sf. 900 is 45 watt per sf. Any pros and cons? Thanks