Mercury Vapor Lights?

Anybody heard or know anything about mercury vapor lights? They seemt o be cheaper than mh or hps, I'm wondering if they produce the correct spectrum of light for growth?

From what I understand is that they have a red spectrum, but nothing like an HPS. Also from what I understand, they take forever to turn on and heat up.

I would recommend just getting hte hps

have a read of this
http://jeb.biologists.org/cgi/reprint/5/2/138.pdf

no mercury vapors dont work andf they produce a greenish blue light i looked at a graph of abailable lighting and i dont think you can even keep a plant alive with one let alopen grow a plant with one don twaste your time