Yeah the redundancy must be nice in a situation like that. I've also heard there's apparently a way to wire a single lamp rapid start ballast so when one lamp fails, is removed, is broken, etc. the other takes over, although the cathodes on the standby lamp might remain heated...that makes me wonder if it would blacken quickly and last about the same amount of time though?
Well it gets pretty dang hot after about 90 minutes, so we'll see. When I can get FS-4 starters so 40w lamps will work it should run cooler...and I plan to convert the other Sears shoplight (With the MagneTek ballast) to electronic or HPF and use the MagneTek for the other lamp in this so it's a 2-lamper again. I'm thinking of putting my PowerTwist lamps in there once it's all finished!