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Latest comment: 19 years ago1 comment1 person in discussion
"2Ø1/2 Half intensity angle (deg)"
This is a very confusing subject, that needs explanation. It needs typical graph curves. LED etc beam width seems to be usually speced at full beam width, side-to-side, down to half of peak (central) power. But sometimes it is given as +/-, which seems to maybe be the angle from the central axis to one side? Please help!-69.87.203.9713:15, 20 May 2007 (UTC)Reply
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