A 60VA transformer can run only one 50W bulb.
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The amp rating for a 100VA transformer will vary depending on the actual voltage of the transformer. Transformers have both a primary and a secondary voltage.
Is the 12V AC or DC? If it's AC, you find a transformer that can step up voltage by approximately a factor of 10, and adjust the output as necessary (e.g. with a voltage divider). If it's DC, then you can build an oscillator that runs on 12V DC and then put it into a transformer. Be sure to know how your oscillator's waveform is effected by the transformer.
THIS IS ONLY DESCRIPTIVE NAME - THE TRANSFORMER USED IN CONTROL PANELS ARE USED FOR STEPPING DOWN TO A LOWER AND SAFER VOLTAGE HANDLING BY TECHNICIANS - 220V,110V, 48V, 24V, 12V, 6V. USUALLY FOR THE COILS OF CONTACTORS, RELAYS, TIMERS, PROTECTIVE DEVICES, PILOT LAMPS, METERINGS.
Here are some places:(Add an "h" prior to the address when you copy and paste) ttp://hsinchang.gmc.globalmarket.com/products/details/transformer-101798.html ttp://www.unelco.dk/files/pdf/UNELCO_Katalog_2.pdf ttp://www.eckind.com/product_2615500_150w-12v-ce-cb.htm
The formula for current is Amps = Watts/Volts. The lamp itself would draw 4.16 amps. Since the voltage of the lamp is 12 volts there is a internal transformer involved in the fixture itself. It doesn't matter what the input (primary) voltage to the transformer is, so long as it meets the manufacturer's specification as to the proper voltage to operate the fixture.