CFL vs. HPS ****Title Fight****

Yea cfl do woneders for the first 2 weeks after that the hps will have superior growth buit definately a 1 week old cfl plants verse hps the cfl 2will be twice the size but other then that there a waste of space and hps put out more lumen per watt and it high intesntisity

I made this for the cause:



Your HPS is a great lumen & heat generator.

HPS.... PAR light? Not really. *Ideal* light? No, again.
Lumen measures intensity to human eyes! Yes, they have that. Spikes beyond 760nm(IR radiation, aka heat waves) yes, those too! Ideal 420nm-460nm & 640nm-680nm spikes? Nope.

Plants 'see best' indigo/blue/cyan and orange-red light. HPS is green-yellow and yellow-orange. What we see best, and plants see best are basically inverted on the visible light spectrum. Human vision is basically a tall bell-curve peaking at ~560nm. This coincides with the peak or near peak(s) of most HPS bulbs. That's why they rate so high in lumens. Right smack DAB in the middle where plants maybe absorb around 50% of that light, but are only using 20-40%(with ~20% going right through the leaves, and 10% reflection). Instead of 80-90% like 400-500nm and 620-680nm.

I think "both" should be an option. CFL's are great by themselves for seedlings as discussed, no doubt, but I use them WITH my hps to get light in every nook and cranny of that undergrowth and get some nice bottom buds!