It was actually used in many old systems as it was much easier to create a 12vac transformer compared to a dc transformer and incandescent bulbs could care less about ac or dc power.
Low voltage landscape lighting transformer ac or dc.
For pricing and availability.
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The ac skin effect is almost negligible at 60 hz so voltage drop along small conductors should be the same for ac or dc and depends on current and the conductor loop resistance.
There are incadescent lamps made for dc voltage such as landscape lighting and for the marine industry.
Transformers generally range from 150 to 900 watt capacity.
Low voltage landscape lighting is mostly 12vac but there are low voltage dc systems.
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The number of lights you can connect to it can be calculated by adding up the total watts of all the lights you want to connect to the transformer which should be less than the total wattage of the transformer.
100 of 14 awg copper 20 c gives you 260 milliohms of resistance and at 1 a would drop about 1 4th volt.
Once your landscape lighting design is complete you can figure out what size of low voltage transformer you need.
Low voltage outdoor lighting transformers in single dual and multi tap in black or stainless steel in voltages from 12v to 22v and inputs from 120 to 277 volts.
No low voltage ac lighting is not just used in landscape lighting to try and spite all those switching to leds.
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