thank you guys for comments and support
it seems my prelimenary assumptions regarding illuminating evenly the outside cover are fake. More I think about it, more I doubt to make it simple and low cost. So I reconsidered the idea of this power supply.
Cyberdemon wrote:Agreed that trying to evenly light an area that large especially if it's just a cover will be challenging (not impossible, but challenging!)
If the main housing is opaque, that type of light pipe would just give you some soft illumination on the top surface at best.
Mike, I agree. I decided to minimize the lighting area to small part placed at the top of external cover.
Now the question is following: can I trnasport the light form hidden LEDs in the way I described in the picture above?