I picked up a couple of case of these oddballs for cheap awhile ago, but I can't find any application information. Since they're apparently still in production (at a crazy price!), they must have plenty of uses, but where/why? Who wants a 40watt T17 bipin lamp when one can have a 39watt T12 slimline lamp on the same ballast?
At first I thought they might have been designed as a lamp/ballast retrofit for the fabled F90T17, but that does not seem right. Any ideas?