1000w HPS in a Pyrex Bake-a-Round? Is it possible?

I understand that "Bake-a-Rounds" can fit a 1000w hps bulb but it barely fits, so venting it is either very difficult or impossible.

I've heard people say that a 1000w hps inside one of these things is "not a good idea", but has anyone ever tried it and failed miserably?

I haven't seen any pics or anything, any comments on the matter would be appreciated.

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