Should my bulbs be vertical or horizontal?

So basically it boils down to if I use a reflector or not, or at least which type of reflector?
 
yeah, well..... sort of.. you could always turnthe reflector VERTICAL and have it along the HEIGHT of the plant...

:)
cheers
 
the most efficient use of a bulb would be surrounded by the plant 360 degrees...go from there...with cfl's it's easy, with hps/mh it requires a screen to keep plants at the cool-enuf distance...
 
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