Results

• Yellow beams can be too much color on the diagram and you can get confused with flash light or tungsten
• White beams looks cool, but you cannot have them on a white background...
• Grey beams might look less sexy than white ones but you can put them on nearly all background colors except light grey...

I tend to think that most people would prefer the white beams as it is more logical with flash light and having a less classy grey background wouldn't hurt so much with a nicely design grid and descent internal margins...

What do you think? Give your vote!