Check to see what type of bulbs they use. If the only bulbs that will fit in them are 55Watt to 100Watt automotive off-road style bulbs, then they wouldn't be good for bicycles. However, if they use MR16 style bulbs, then you can put smaller bulbs in (10Watt to 20Watt) and they would probably work fine.

I looked at WalMart driving/fog lights when I was in the design phase of my DIY. I wasn't very impressed. I think they had blue-tinted lenses that gave a fake impression of HID while using halogen lamps. Pfft.