What are good lights for growing?

[Weezard]

I only run a 6 bulb 4 foot in bloom. 324 Watts makes 1/2 the heat of that 150HPS light...and I really don't need the sidelight due to the way I open and prune my plants so there isn't a bunch of low growth. That way penetration is less of an issue. as well as the need for a sidelight. My sidelight is only a 2 foot 2 buld T5HO...you get more heat from a 26 watt CFL than that put's out.
For small cabinet/closet grows with heat issues I don't think there's a better option other than LED. I'm thinking about doing a straight watt for watt comparison with the T5's and an HPS....we will see.

Been here, done this.
Leds win, hands down!

(In most cases.
There are strains that don't do well under any artificial light.)

HPS vs LED, watt for watt?
Because LEDs can target the most efficacious wavelengths and waste no Watts on poorly used wavelengths, it is almost, but not quite, 2:1.

It's less dramatic with T5's but there they win with tighter buds and superior penetration.
Been usin' mine since 2006.
Very happy with them.

Aloha,
Weeze