Not many. I would say it would be nice to throw in with other light though. Check out the light Guide in my sig.
Thats kinda like my setup, i have 4 of the 48 inch 45 watt cool white fluoro tubes, a 16 watt CFL and a 26 watt CFL. Throw the metal halide in with the other lights and have a ball.
Ihave never heard of a 60 watt MH.The smallest i have ever seen was a 75 watt MH and that too was a antique that i found.Are you sure those letters aren MV>Mercury Vapor instead of MH?