30W Cree LED Emitter 30 Watts Red Blue Grow Light DIY

[silverwolf72]

http://www.topledlight.com/30W-Cree-LED-Emitter-30-Watts-Red-Blue-Grow-Light-DIY_p1096.html

How well would these work?
I like the small size and price

[Floyd R Turbo]

Cree doesn't make a Deep Red. These are 630nm Red. Not saying it won't work, but most get better results from 660s.