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When measuring light, the lumen and the watt both measure power -i.e. the rate at which electromagnetic energy is emitted (for visible light, this 'power' is termed 'luminous flux'). Although they are both SI units, one (the lumen) is used in the photometric system of measurement, whereas the other (the watt) is used in the radiometric system of measurement. Whereas the watt is used to measure the total rate at which electromagnetic energy is emitted from a light source, the lumen is used to measure only the visible part of the spectrum and, then, corrected for the sensitivity of the human eye (the eye is most sensitive to the green part of the visible spectrum. The watt, of course, can also be used to measure the input power to a lamp.
In the radiometric system, the input and output powers of a light are each expressed in watts, but in the photometric system, the input power of a light is expressed in watts, but the output power (luminous flux) is expressed in lumens. The ratio of a light's output (in lumens) to input (in watts) power, is termed efficacy (NOT 'efficiency'), and it various according to the type of light. An incandescent lamp, for example, has an efficacy of up to about 15 lumens per watt, whereas a fluorescent lamp has an efficacy of around 50 or so lumens per watt.
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What is the lumen of 23 watt CFL?
A 23 watt cfl will give off roughly 1600 lumens. However that is only within a few inches of the bulb.
What does A 170 lumen flashlight equal in a watt flashlight?
The energy consumption of a modern Cree XP-G or XM-L based flashlight with 170 lumen output can be as low as 1.4 watts with 120 and more lumen per watt. The light output will be approximately equal to a 20 W tungsten incandescent light bulb or a 10 W halogen light.
How many lumens does a a 1 watt led bulb produce?
Generally speaking, the lumen per one watt of different LED is different. As far as i known, some LED products can reach 120 lumen per watt or more higher which from lab or some big famous comapny, we called this is lab level, but in fact, most of companies and LED manufactures can not reach this level, theirs LED products are differenet, some of they can reach 80~90 lumen per watt, but some is very low, like companies power, technical level, product develop and many others factor will effect the lumen level. Of course, all of this conclusion is base on the test report of LED product, like lumen, color temperature, CRI, illuminances etc parameters.
What is the lumen output of a 60W incandescent bulb?
The output of bulbs varies. A typical output of a 60W incandescent bulb is 680 lumens.
How many Lumen's can a 60 watt bulb produce?
This depends on the type of bulb and it's efficiency. Incandescent bulbs produce 700-900 lumens at 60 watts.
What is brighter 2000 lumen watt bulb or a 1500 lumen bulb?
This question is ill posed. Lumen is a unit of measure for how much light comes from the lamp Watt is a unit of measure for how much energy is used by the lamp If the question were; "Which is brighter, a 2000 lumen bulb or a 1500 lumen bulb?" then the answer would be: The 2000 lumen bulb. I think the relation ship between lumen and watt is something like: Incandecent bulbs are 15w/lumen Flourecent bulbs use 40w/lumen LED bulbs are 70w/lumen The way to show the watt and lumen relationship is usually lumens (amount of light) per watt (energy consumption). This is like gas in your car (Miles or KM per Gallon or Liter). Incandescent bulbs have a maximum luminosity of 52 lumens/watt. Fluorescent bulbs range from 46 lumens/watt (CFL) to 100 lumens/watt (T5 and T8 tubes) LED bulbs range from 29 lumens/watt (older, low efficiency) to 100+ (XCree) and they are getting better.
What is the lumen's of a 70 watt metal halide lamp?
6000lm
How many lumen's are in a 5 watt led lamp?
25
Lumen per watt for halogen bulbs?
around 20
How many lumen are in 1 Joule?
1 lumen = 1 candela per steradian.1 candela = 1/683 watts per steradians (assuming 540nm light wavelength).Assuming that the light is collected from a single steradian:1 Lumen = 1 Candela -> = 1/683 Watt -> Watt = 683 Lumens1 Joule = 1 Watt per Second -> Watt = Joule/SecondHence:683 Lumen = 1 Joule/SecondUnder the above assumptions1 Lumen = 1/683 Joule/Second
How many lumen output in a 50 watt power led?
Typically power leds operate as 1-2 watt units. 50 watt is a little excessive for a single led: it would have to be an array. The light output that can be achieved in normal use appears to range from 80-120 lumen/watt, so I guess the answer would be something like 4000-6000 lumen!
What is the lumen output for a 100 watt fluorescent lamp?
10-11 lumens per watt for incandescent bulbs 13-14 lumens per watt for halogen 50-60 lumens per watt for fluorescent
Is 650 lumen's bright?
A 50 watt incandescent bulb is about 650 lumens.
What is the lumen output for a 52 Watt halogen bulb?
Should be about 850 lumens. The same brightness is produced by a 15 watt CFL.
What is the lumen of 23 watt CFL?
A 23 watt cfl will give off roughly 1600 lumens. However that is only within a few inches of the bulb.
What energy saver bulb given off 1750 lumen?
That would be approximately a 30 watt CFL.
What does A 170 lumen flashlight equal in a watt flashlight?
The energy consumption of a modern Cree XP-G or XM-L based flashlight with 170 lumen output can be as low as 1.4 watts with 120 and more lumen per watt. The light output will be approximately equal to a 20 W tungsten incandescent light bulb or a 10 W halogen light.
