600w Dual spectrum HPS vs 600w HPS

Has any one here compared the yeilds from a 600w DS HPS and a 600w hps? Which bulb would be better for flowing?

Any one? Bump

Bump,

C'mon guys. Who uses supplemental mh lighting along with their hps in flower? It's common knowledge for some that BOTH spectrums produces a noticeably better product. The shortening and thickening affects of a metal halide along with the potent affects of the hps. More spectrum = more efficient plant. I don't know about you guys.

But I'm trying to simulate the sun.