If your asking if you can use a 1000w light on a 400 ballast, the answer is no. If your asking if you can use the 1000w bulb in a certain hood, if it fits than generally yes you can.
Hope I understood your question right.
Adieu
BlueBear Reviewed by BlueBear on . lights Hi to all I got a queston?What dose{ KV5} on the HID light socket mean? I have a econo 6" air cool light shade and I ordered a 400w ballast.Can you use a 1000watt ballast with this shade? all help will be greatly appreciated:rasta: Rating: 5