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self ballasted metal halides ?

Today I saw some metal halide bulbs which were self ballasted.. they screwed
straight into a normal light socket or an large edison screw and didnt
require a ballast.. they were rated at 150W and 450W and looked like your
typical hydroponics bulbs.. anyone heard of these or had any experience.. I
was told you should moutn them in a normal metal halide hood as they become
quite hot..the colour temp was below 4000K

Jon H