So, an electronic ballast has a rating, as well as, in some cases a lamp
type. OK, thats simple. But then, there are so many lamp types and
wattages, that keeping a stock of ballasts in the van for each type of
lamp would be costly.
Testing a few yesterday, it seems they cannot be reliably inter-changed
between types.
Why wouldn't a 36w linear ballast work with a 28w 2D lamp, and vice
versa?
OK, rating at 8w over rating may be asking too much, but why not run a
28w off a 36w ballast?

And a 2 x 36W works with one lamp lit, the other not working, but
wouldnt work with a single, good, lamp fitted?



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