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Look on the end of the bulb for the wattage rating. Multiply this by the time the bulb is on and you will get watt/hours.
CommentThe above answer should read watt hours, notwatt/hours.
It's also worth pointing out to the questioner that a lamp does not 'use' watts. A watt is the unit of power, and power is the rate at which the lamp uses energy. In the SI system, the unit of energy is the joule, so a (for example) 100-W lamp uses energy at the rate of 100 J/s (joules per second). For the purpose of billing, energy supply companies measure energy in kilowatt hours (there's no reason why they shouldn't use kilojoules or megajoules, but they use kilowatt hours for traditional reasons). So your question really should read "How many joules (or kilowatt hours) does one bulb use?"
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoIt varies. It is usually printed on the bulb.
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The small 120VAC bulbs sold as night light bulbs, the ones that have the small screw in E12 Candelabra Base, are rated at either 4 or 9 Watts.
Wiki User
∙ 12y agoEach LED lamp is different. There will be a specification for the real wattage and sometimes you will see the LED compared to the light output of a traditional incandescent bulb wattage. You need to look carefully at the LED specification. Two important numbers are lumens and color temperature in Kelvin. You can get specific data on web by searching for color temperature and lumen comparisons on the web.
Wiki User
∙ 13y agoLED bulbs come in different sizes and powers.
Roughly they consume about 10% of the power to create the same amount of light as a normal bulb.
Wiki User
∙ 13y agoLike any other electrical light, they will use the amount of power listed for that particular light. Most current ones will be between 3-8 W.
Wiki User
∙ 12y agolike nuthin at all
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How many watt does an exit light use?
If the exit fixture uses a LED lamp it will have a 1 to 3 watt rating. If it is a incandescent bulb, each lamp will draw about 25 watts each.
A LED light of 3 watts gives off the same amount of light as an incandescent bulb of 45 watts This means that the LED light.?
A 3 watt led light is not the same as a 45 watt bulb. A led light is a lot brighter.
What is the luminous intensity of a tube light led and a 60 volts bulb?
Apples and oranges. The led quantity, quality and effeciency make all the difference. As far as a 60 volt bulb... How many WATTS?
How bright is an led bulb marked 100 lumen?
Brightness is measured in lumens so the bulb has a brightness of 100 lumens. The electrical power the bulb uses is measured in watts. The efficiency of a bulb is expressed in the number of lumens produced per watt of electric power.
How many amps does a led light draw?
Depends on the size of the LED light and the voltage applied. An example is an LED 24 volt globe light that pulls 8 watts which draw 0.333333 amps. Take an LED 120 volt light bulb draws 12 watts and will pull 0.1 amps. The same bulb at 240 volts wil draw 0.05 amps. it really depends on the watts and voltage applied. An average would be about 0.1 amps.
Which light bulb has fewer watts?
LED.
How many watts are in 60hz?
There are 1350 watts in a 60 hz bulb. There is a push not for everyone to transfer to led bulbs.
How much electricity a light bulb uses?
That depends on the type of bulb AND on it's power usage. An old incandescent bulb of 100 watts uses about an amp, a 60 watt uses about a half amp. But a florescent bulb putting out the same light would consume about half the current, and a LED bulb would use less than half that.
How many watt does an exit light use?
If the exit fixture uses a LED lamp it will have a 1 to 3 watt rating. If it is a incandescent bulb, each lamp will draw about 25 watts each.
A LED light of 3 watts gives off the same amount of light as an incandescent bulb of 45 watts This means that the LED light.?
A 3 watt led light is not the same as a 45 watt bulb. A led light is a lot brighter.
What is the luminous intensity of a tube light led and a 60 volts bulb?
Apples and oranges. The led quantity, quality and effeciency make all the difference. As far as a 60 volt bulb... How many WATTS?
How bright is an led bulb marked 100 lumen?
Brightness is measured in lumens so the bulb has a brightness of 100 lumens. The electrical power the bulb uses is measured in watts. The efficiency of a bulb is expressed in the number of lumens produced per watt of electric power.
The 4017 integrated circuit is a type of what circuit?
led to 250 watts bulb
How many watts does a 32 inch Samsung LCD TV use?
An LCD TV with a traditional flourescent backlight uses about 110 watts of power. A LED backlit LCD TV uses about 85 watts of power in the 32-inch size.
How many amps does a led light draw?
Depends on the size of the LED light and the voltage applied. An example is an LED 24 volt globe light that pulls 8 watts which draw 0.333333 amps. Take an LED 120 volt light bulb draws 12 watts and will pull 0.1 amps. The same bulb at 240 volts wil draw 0.05 amps. it really depends on the watts and voltage applied. An average would be about 0.1 amps.
What are some technical specifications of a white LED?
There are many technical specifications of a white LED light bulb. Depending on the watts emitted, the luminous intensity of a white LED is 18000, with a viewing angle of 30 degrees.
How much energy used in a light bulb every second?
That depends a lot on the type of lightbulb. Check the number of watts on the lightbulb - watts means joules / second. An old-fashioned incandescent lightbulb might use in the range of 40-100 watts (joules/second); 100 watts for the brighter ones. On the other hand, a fluorescent lightbulb uses around 40 watts for the brighter ones, and a LED lightbulb uses even less.
