Metal halide fixture

[bmwalley]

Hey I have a 150 watt metal halide fixture that i bought 2 years ago. I wanted to go up to 250 watts. Some guys just told me I could just change up the ballast to a 250 . does this seem right

 

[vangvace]

Assuming it's a DE fixture you will have to change to bulb's socket as well.

 

[mikem]

Assuming it's a DE fixture you will have to change to bulb's socket as well.

Correct.
It it's SE (mogul)you just need to change the ballast.