when light is absent.....?
477703
The cat or the room?\nLight does not give us color. Our color was predetermined by our DNA. The light just potentiates or enhances what already is.
841235
light sensitivity is a remote possibility, but possible none-the-less.\n\nBest to try it in the sun before laying under a light bed.
39416
if there was no source of light (sun,stars), there would just be dark!
1121489
Sorry but darkness is not a measurable thing. the absence of light however is! The absolute absence of light leaves the condition referred to as darkness. likewise cold does not exist only the absence of heat. thermal dissipation is the term I believe so I guess we could call darkness, photonic dissipation? wink wink nudge nudge.
887711
Light IS energy...sorry I can only think of one...:(
605247
the Sun and another point where there is no object
1039389
Its dark in your world, isn't it?  :-)
1093430
reflection or shadow!!
202494
your reading in aplace that's not well illuminated...
35130
Zero....Illumination is tracked by the speed of light but the lack of illumination means that nothing is moving.
293400
when no petrol is available
801568
I did an experiment with this in graduate school.  When a plant has limited to no light, it invests all of its energy and growth into finding a light source.  In my experiment, the plant grew very tall and had very few leaves (since it could not go through photosynthesis anyway, why bother).  It was a very interested experiment and proved that even plant have priorities.
735058
If you shine a flashlight in a dark room, the beam of light must hit an object in order for you to see it. If there is nothing to obstruct the light, then you will still see a dark room despited the flashlight. The same is with the sun, the planets are visible because they obstruct the light and reflect it back to our eyes. Everything else is black because there is nothing there.
86593
A lamp. I feel "enlightened" by much that I have learned. Perhaps if the lamp is turned on (not that way ....for shame!) it could provide illumination to those who can not see in the darkness. Yeah...I wanna be a lamp. :)
305424
The pressure would be higher, the temperature would be lower, the light would be less.
1079952
The sun wouldn't rise or fall..., it just would be light all the time...
400598
All of the light "floating" in the air is composed of photons which are eventually absorbed by the atoms in the room and converted into heat.  This heat eventually dissapates through the walls and radiates outside the room.  Of course, there is an imperceptable delay between when the last photon leaves the light and is absorbed by the walls, but this happens at the speed of light and can't be seen by you or me.