Because of the high input impedance of your meter, the test leads are effectively antennae, picking up all kinds of noise. You've probably noticed that when you connect only one lead, the display drifts all over the place and probably gives you some false reading. You need a low-impedance load across the input to short out that noise. Any normal load, such as a light bulb, will short out the noise.
Checking voltage with a load also ensures you have good connections and don't have a marginal switch. It's possible to have a solid 120 volts coming out of the wall with no load, but have that go to zero as soon as you add a load.
My guess is your light has a bad switch or other connection. The problem is gone for now, but it will be back.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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