If you are not an electrician, (obviously you're not) I wouldn't dick with the ballasts. Fire and electrocution are a definate possibility if you screw-up.

I'd use the 175's for either side lighting, or perhaps in a seperate clone-n-seedling closet.
Rusty Trichome Reviewed by Rusty Trichome on . Two bulbs per ballast? I've looked in some electrotech forums and now I'm more canfused than ever! Has anyone ever run two bulbs on one ballast at the same time? I'm wondering if it's possible to run two 175W bulbs off one 400W ballast, and would the bulbs necessarily have to be wired in series or in parallel? Anybody ever had strech things out like this? Rating: 5