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<p>[QUOTE=&quot;messydesk, post: 2876732, member: 1765&quot;]TPGs use lights that are close to being a point source, typically small halogen lights, but the point source is more important than the construction of the bulb.&nbsp; This helps to see problems.&nbsp; Even more important is that the lighting is consistent.&nbsp; There are some people who will take their own lights with them to a coin show and inspect coins under their more controlled lighting before making a purchase decision.[/QUOTE]</p><p><br /></p>

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