In this context only!

Swedish term (edited): se ut som bleka döden

Perhaps.

I am not sure if it fits the context, though, or what they intend to say. (Do they e.g. want to say that everything human looks dead _in comparison with_ those diods (because those diods look so great), or that the diods look so horrible that they _make_ everything human around also look horrible?)

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Note added at 6 hrs (2011-03-26 07:01:47 GMT)
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Also perhaps:

se ut som bleka döden = pale away

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Note added at 6 hrs (2011-03-26 07:05:08 GMT)
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Seeing a similar text on the web page, I guess the meaning is negative and causative: the light of the LEDs is so weak and unattractive that it _makes_ human things also look unattractive.

another way of saying it
pale death or deathly pale, either or

a variant meaning pale.

if you want a proper and succinct idiom...