difference bet DE and SE MH bulbs?

Discussion in 'Lighting' started by ziyaadb, 22 Feb 2010.

  1. ziyaadb

    ziyaadb

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    Can someone please explain the difference between DE and SE MH bulbs. I know the obvious difference in the contact points. But why is it that SE bulbs do not need a UV glass and DE need the UV glass?
     
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