Not many but it depends on the specific design! Look on its own label, either on the lamp or the supplier's packing.
It depends if you use a newer LED, or older incandescent bulb style.The old bulb style (still popular, and usually cheaper to buy) use about 7 watts.If you use that for 8 hours, you would use 56 watt-hours. For a year that would be about 20.5 kWh (kilowatt-hour).An LED style light may be 1/4 watt, which works out to be .73 kWh. per year.How much that cost depends on where you live, and what rate you pay. 10 cents an kWh is a reasonable approximation for the United States. At that rate, the Bulb light would cost about $2 a year, and the LED would cost 7 cents.If you leave the light on all the time (in a dark bathroom) triple these numbers. The bulb style would be $6 and the LED about 20 cents. You can see that although the LED light is more expensive up front, it could pay for itself in energy savings in about a year. But neither light will cost that much to run.NOT MUCH, I would say A penny or less A day.....a different (cost and environmental) perspective - although the answers above are correct, for small devices using cost always gives answers that seem tiny. For 2 reasons we should get away from this approach: (1) lots and lots of small items add up to a lot; individually they might be small but if that means we ignore all small costs they soon add up. (2) think carbon - 20kWhrs is about 20kg of carbon dioxide (say 45 lb) a year - that's about 13 cubic metres of greenhouse gas just for a nightlight!
$40.00 a year
It depends on your location.
The cost to run a 400 watt HPS light will depend on your electricity rate. On average, running a 400 watt HPS light for 1 hour will cost around $0.06 to $0.12. To calculate the monthly cost, multiply the hourly cost by the number of hours the light is on each day, then multiply by 30 days.
If the transformer uses 5 watts per hour you need to know what you are paying per 1000 watts from your power company. If you pay lets say $3.00 for 1000 watts then when your transformer burns 1000 watts it cost you $3.00 your cost will be $3.00 for 200 hours run time.
a nightlight can cost a few dollars depending on the type of nightlight it is such as a bulb or sensor. the decor of the nightlight can be factored in the cost as well.
NightLight was created in 2011.
it cost 50$
Yes a baby can sleep with a nightlight without awakening. It does, however, depend on how much of a light sleeper the baby is, since all babies are different. But generally, a nightlight should not be a problem as the light is soothing and not blinding like the ceiling lights.
Nightlight - 2001 was released on: USA: August 2001
a lot
Millions
2000$
0.00
$30-40, depending when you register.
The Nightlight Zone - 2012 was released on: USA: 9 October 2012
about 1.5 million a month