Power = Voltage x Current that's all to it.
Now light bulb technology has a lot of effect on how much light a bulb will produce: incandescent will use about 5% of its rated power to produce light, the rest will go into heat. LED will use 30-40% of its rated power to produce light which allows to use lower wattage 110V LED 'bulbs' to produce exactly the same amount of light as their incandescent counterparts saving a lot on your electric bill / battery capacity. You just need to pay attention to additional characteristics of LED 'bulbs' - color temperature and color reproducing index (CRI). I personally prefer 2700K and CRI > 90%. With such parameters I am unable to distinguish LED from halogen bulbs which are considered the closest match to sunlight.
Now light bulb technology has a lot of effect on how much light a bulb will produce: incandescent will use about 5% of its rated power to produce light, the rest will go into heat. LED will use 30-40% of its rated power to produce light which allows to use lower wattage 110V LED 'bulbs' to produce exactly the same amount of light as their incandescent counterparts saving a lot on your electric bill / battery capacity. You just need to pay attention to additional characteristics of LED 'bulbs' - color temperature and color reproducing index (CRI). I personally prefer 2700K and CRI > 90%. With such parameters I am unable to distinguish LED from halogen bulbs which are considered the closest match to sunlight.
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