When I was germinating my seeds, I used a regular plastic bulb fixture with a pullchain on/off, a Y connector screwed into that, two other Y connectors screwed into the first, and the 4 bulbs screwed into those. No having to use cheap stuff like rubber bands or w/e, worked perfectly for me. I also made reflectors out of coke cans :D
can't see the base and everything, but you can see how the lights looked
this way you get the most light out of the bulbs onto the plants as possible, since they're more perpendicular to the tops of the plants (as opposed to the one with the power strip, where the light mostly goes to the sides)