This is in fact a common way of making LED “throwies” - just a 10mm LED, a CR2032 coin battery and a neodymium magnet all taped together..
Ignore this post.
I got LEDs because I didn’t want to have to use 1800W current. I was trying to get something completely safe.
I don’t know how to get an incandescent bulb any more. Fluorescents don’t dim well, so I’m at LEDs.
I wasn’t talking about using bulbs intended for household 110V current. But rather low voltage flashlight bulbs like these: Amazon.com : incandescent flashlight bulb.
Amazon, search “incandescent flashlight bulb”. But the chain hardware stores have them, too.
ETA: Damn you, @LSLGuy! 
This won’t electroplate the electrodes in the ohm meter?
Not if the meter is the excitation source; it sources just a few hundred microamps for the resistance function. Plus your test probe tips likely have a nickel plating on them, which is very corrosion resistant. (The tips of your fingers have a layer of saltwater and acids, yet touching the tips of the probes won’t cause them to corrode.) If you’re concerned about it, simply use a couple stainless steel probes in the jar of water (stainless steel bolts would work fine), and connect to them using alligator clips.
60 Hz is well above the flicker rate. The light would look steady. The standard for film movies was 24 frames/second.
The flicker fusion threshold is highly dependent on circumstances and is usually higher (sometimes way higher) than that. You probably will have seen 60 Hz flickering in the wild. In the right settings the fusion threshold can be north of 1 kHz for some.
For the experimental set up proposed above, there are many things working toward higher fusion thresholds. The type of light source offers no intrinsic persistence; the intent is to run it at non-design currents; the source will be only half-rectified AC, leaving the LED off more often than on; the LED is a visual point, meaning persistence in the visual system doesn’t help during eye motion (voluntary or otherwise); the room lights will probably be dimmed or off; and the audience appears to be a room full of teenagers, for whom flicker fusion rates will be highest.
I hedged in my original mention of this, but to be honest, I would definitely bet that the flickering would be noticeable in this scenario.
If you are waving the light around, yes you can see stroboscopic effects. That seems more like fun than a problem.