Well dip me in shit and roll me in sugar.

Here's the best I've seen so far:

YouTube - LED vs. HPS 25 days into flowering

Or search youtube for "LED vs. HPS"

He did several videos at different stages, but this one is the last, and it's 25 days into flowering. Where is the results video?
Opie Yutts Reviewed by Opie Yutts on . LED grow lights... input please. Hello guys, I'm exchanging eMails with a representative from a LED company. I asked him if they could produce a custom light for growing, and here's what he told me: Our options are as follow: 940nm, 850nm, 660nm, 630nm, 610nm, 590nm 570nm, 530nm, 510nm, 470nm, 460nm, 400nm and a total of 64 LEDs in the bulb. Rating: 5