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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