hi all, since i repair a hell of allot of these here's my advice
Halogen, power hungry but reliable and not too worried about too much power fluctuation in the supply voltage. pretty heavy draw off a battery though. Animals usually stand still in the light
LED. not so power hungry, do not like uneven DC like a farm bike that does not have a battery. my experience is that rabbits tend not to be "stunned" by it.
HID : repaired literally 100's so far: pretty good on battery drain. do not like batteries that are going flat. do not like an overcharging vehicle power or the farm bike power supply. most on sale do not like to run constantly and overheat the invertor units built in (the discharge tube runs at about 22.000 volts). also even though it may be rated 35 watts the wattage at strike up is almost double that so you may find if you are running off a battery and switch off it wont switch on next time if the battery is getting low. Animals "stunned by it" more than LED
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