Unfortunately not.
Maybe it depends on the fact that on my car (VW Polo III, latest model) the empeg is pretty much exposed to the sun. However I guess several cars may have the same layout. Is there any way to increase the brightness even more?

Taym
empeg mack II blue 12Gb
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= Taym =
MK2a #040103216 * 100Gb *All/Colors* Radio * 3.0a11 * Hijack = taympeg