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Ballasts for Metal Halide

Are there any reasons why I should consider buying an electronic ballast
rather than a much cheaper tar ballast ?? I fancy buying an electronic unit
but they are so much more expensive than an equivalent tar ballast - are
they that much superior ?

Andy Moore  -  andy at ascot_u-net.com

Planted Aquarium Tank Fanatic &
BBb Tuba Player in the Poulton-le-Fylde Brass Band:-