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Date: Fri, 11 Sep 2015 09:16:25 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] 5630 LED footprint
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> It's debatable whether bare (shiny) copper or soldermask can dissipate
> heat better.  I've heard both ways, although I'm partial to the
> argument that a matte black mask would be the best emitter.

I also agree about the matte black especially if allowed to get really hot although it should be matte black in the infrared region.