My daughter's IKEA reading light has/had a 12V 20W bulb with a transformer that listed that it output "11.5V ~ 10-20W 60Hz".
The transformer stopped working, and I can't find a replacement available online. In my electronics pile I found a transformer that outputs "15V ~ 1000mA" (no mention of frequency, and I've no oscilloscope here to measure it).
I spliced and soldered the light fixture to the new transformer, and it works. The transformer does not get hot with prolonged use, but I'm wondering:
Since 20W / 15V = 1.33 amps, is a Halogen bulb like a low-ohm speaker, where it's going to have such a low resistance that it's going to pull 1.3A through the transformer and it's skinny wires, possibly causing a fire hazard to it? Or do things not work like that with AC, and if anything the bulb is being over-volted but under-powered, and I should feel good about my hack?