Fix another light into place in your hood if you can, then its as simple as buying a lighting unit and plugging it in. The lighting unit will be external so no worries about finding space for that.
gut it, buy some sockets and slap 3 bulbs in there and buy an electronic ballast that's able to control up to 3 f20t8s and build an external box for it.
Better yet, buy a glass top, and a new light strip with power compacts.