Cool that you find it. I am always for recycling abandoned things.Ballasts can work for many many years but thing with bulbs is that you need to change them after every periodic grow. They lose specter after predicted working hours. But they are not so expensive here so in states they should be more cheaper.

I forgot to ask before why level is important? I never cared for that and I have some memories where they used bells for reflection and bulb positioned vertical.