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A halogen bulb works equally well with AC or DC.
Yes. It just won't be as bright.
No. Only replace lamps in a fixture that the manufacturer of the fixture recommends. By installing larger than recommended lamps this could create a fire due to the increase of heat generated by the over size lamp.
If it is an 18 watt 12 volt bulb, then yes. But an 18 watt 120 volt bulb - then no.
A halogen bulb IS ITSELF a type of incandescent illumination source. A 40 Watt traditional incandescent bulb usually emits about 400 to 500 lumens while a halogen may emit close to twice that. So a 25 W halogen might give out as much light as ah older style 40 W bulb.
Halogen bulbs are about 30% more efficient so a 70 watt halogen does the job.
It's a halogen bulb
yes the bulb will actually last longer
Approximately 15 lumens per watt for halogen, so 300 lumens.
Yes, the halogen bulb would provide about 30% more brightness (lumens) for the same electric power rating. So 70 watt halogen is about equal to 90-100 watt incandescent.
A 230 watt linear halogen lamp should be replaced by a 230 watt linear halogen lamp if the same brightness is required.
Nobody has "240 watt mains". Perhaps you meant "240-volt mains".You would need to have a lighting or receptacle branch circuit, with over-current protection, in order to use any halogen bulb.However, if you have a 300 W bulb, it should work nicely in a 15-A or 20-A branch circuit.