http://en.wikipedia.org/wiki/Luminous_intensity
http://en.wikipedia.org/wiki/Luminance
http://en.wikipedia.org/wiki/Radiance
Have you ever seen divine light, radiance?
When i had seen it, i was amazed. It was night and the area where the light didn't cover had become pitch black. The other sources of lights like street lamps had become out of context negligible as the divine light had taken over. Our eyesights have the ability to perceive only man-made sources of light intensity, so the color differentiation that our eyes can see is of lower nature. When the divine light radiance appears the true colors are seen of various objects appearing around us, like as described in the 'luminous intensity' greenish-yellow bright colors!
So is physics a divine subject and so do its inventors ...spiritual scientists!