Popular Opinions Say You Need HPS, So Whats This?

I see posts everyday that say you just gotta have HPS. There is a least one Hydro shop that says many of you don't need it

I recommend using HPS only if you think you HAVE to grow plants over 2.5 ' tall.

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http://www.seattlehydroponics.com/index.html

He must not be selling the same lights everyone else is selling.

Its a fancy MH mate so hps should serve you better as for bulb size it will depend on area