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 - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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