On the DON'T BUY list for 2017;
1. SE HPS- obsolete, power hungry, bad spectrum, lamp replacement every 6 months.
2. MH of any kind; very inefficient, power hungry, lamp life even shorter than HPS.
3. T5 for anything but UV supplementation; short lamp life, inefficient, hard to get enough light to be effective.
4. DE HPS; still not efficient, HOTTER THAN FUCK, lousy spectrum.
5. Any Blurple LED; poor spectrum, generally low efficiency and they don't last- often because the units are made cheaply and therefore run hot enough to limit longevity.
CONSIDER THESE INSTEAD;
1. 315W CMH lights- more efficient, decent spectrum, lamp replacement interval is up to 2 years, low cost of purchase.
2. COB LED- can be highly efficient, great spectrum, well designed units don't have replacement intervals.
3. Quantum board LED- highly efficient, long lasting, great spectrum.
Your wallet and your grow will thank me if you follow this advice.