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I don't know anything about the bulbs or their use, but it seems that the shorter distance you gain between the lamp and the reflector compared to having the reflector a little ways out and around the bulb itself is not that considerable, and the cost of having them put a reflector inside the bulb just isn't worth what you gain. Like I said though, no experience and haven't read about them at all, but that's my uninformed take.
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