I have seen amazing results in controlled experiments with dual arc bulbs,
the ones that are both a 600hps and 400mh in one bulb.

I thought they would not compare to a straight 1000hps due to less penetration and lumen output, as a 1000w hps is like 145,000 lumens, and the dual arcs are less lumens, I wanna say something like 112,000 lumens, but I could be wrong on that number.

But every plant grown with dual arcs was bigger than the ones grown under hps, just some food for thought.