The speed of darkness is at the speed of how quick you turn off that friggin' light now go to bed!!!!

Since light and darkness cant exist in the same space, darkness would disappear at the same rate that light travels, thus if darkness had a 'speed' it would be retreating or advancing at exactly the same speed a beam of light would. Just as a vacuum has no substance to it, darkness is the equivalent 'vacuum' in the light spectrum.

Well, it's faster than light. Here's my evidence... When you switch off the lights, they go off ASAP. However, when switching them on it takes a few milli sconds... This proves that darkness has beaten light! <br />
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So I can't give you an wxact answer, but it's faster than light and slower than my brain ;(

how do you know it's just not the light bulbs warming up fast enough?

Because the same thing happens with candles/ fire on a log (olden day torches) LOL.

i imagine dark spreading or coming into being, not traveling. in my mind dark defies the concept of speed.

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we can't see in the dark so no one has clocked the speed of dark yet silly