The housing is part of the bulb cooling system so it has to be properly mounted to cool
I did a quick look for the bulb and yes you can find bulb only BUT they are $10 to $20 more than the bulb and housing !
So it looks like it is cheaper to replace the bulb and housing. As a guess I would say that these bulbs are what someone has found out to be a replacement but can't purchase then as cheap. So to save yourself some money buy the combo.
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