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<p>[QUOTE=&quot;rmpsrpms, post: 3358724, member: 31773&quot;]Ringlights are too multi-directional to show luster. Luster presentation depends on reflection of light off the surfaces of the flow lines. Single lights do best, and excite a single &quot;luster bar&quot;. Two lights at 90-deg angles are also good and excite 2 luster bars. Any more and the lights start to interfere with each other&#039;s luster bars, until you get to a ringlight and there are no luster bars at all.</p><p><br /></p><p>edited to add: the best placement for the lights to excite luster is actually 10:30 and 1:30...no kidding. These two clock positions are orthogonal to each other (at 90-deg angles) so they minimally interfere[/QUOTE]</p><p><br /></p>

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