Quote:
Originally Posted by KeeperOfFish
Only HQI bulbs need a piece of glass because they produce UV rays. A mogul based bulb does not produce any UV rays so it does not need any glass. Hope this helps.
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Mogul base bulbs do produce UV but the glass envelope of the bulb is the shield. A mogul bulb is nothing but a HQI bulb with a built on UV shield.
ALL HQI bulbs MUST use a separate UV shield.