Cheap Flood Lamps for Metal Halides

[jdh22]

Has anyone looked into using outdoor metal halide flood lamps for thier tank lighting? I was looking at a 150W MH for only $70:

http://www.affordablelighting.com/smallfloodspot.html

But when I look for MH's specifically for aquariums they run between $150-$300.

Other than having to get a different bulb for the flood lamp is there any other difference?

[SurfnFish]

Try posting this in the New to Hobby Forum. You might get more answers there. I am also interested in this.

[audiowerks]

I don't think those are designed for areas of high dampness and corosion. I saw on another forum someone using similar but they moved ballast away from fixture.