Glowhoo is for noobs who are "proud" they finished the hard raid or for those who don't care about shaders.
One exception is with the iron banner warlock chest piece, it looks like a bad ass neon lightbulb.
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Glowhoo was only cool if you were rocking it the day of or second day after Hard Mode Launch. If you still wear it now well, you're a scrubby dub dub.