I have seen amazing results in controlled experiments with dual arc bulbs,
the ones that are both a 600hps and 400mh in one bulb.

I thought they would not compare to a straight 1000hps due to less penetration and lumen output, as a 1000w hps is like 145,000 lumens, and the dual arcs are less lumens, I wanna say something like 112,000 lumens, but I could be wrong on that number.

But every plant grown with dual arcs was bigger than the ones grown under hps, just some food for thought.
MimbresValley Reviewed by MimbresValley on . Impressed So far I'm impressed with the Sun System Sunblaze 46 4 foot T5. I've noticed an inch and a half growth already in less then 48 hours. I have the light about 2 in above the tallest plant and angled toward the smallest. There is great potential in these systems. They're inexpensive, use less the $20.00 a month in electricity 24/7 in veg, and fit great in a two foot deep closet. I could daisy chain another one and utilize the 6' whole close with a 24" 4 lamp model. Would be excellent with Rating: 5