how many lux per watt does the led bulb produce?

Question

how many lux per watt does the led bulb produce?

Answer 1

First of all, lux are lumens/m^2. So lux are pretty much application-dependent: you can get (almost) as many lux from a given light source as you want by moving your test surface closer to it. By moving farther away, you can get as few lux as you want, down to about a microlux or so if you're in deep space far away from galaxies.



So the real question you want answered is lumens per watt.



Incandescent bulbs are bad: about 10 lumens/W is the ballpark. Halogen lamps are about 4 times better, and LEDs and fluorescents can be up to 6 times better.



The starting point figures should be obtained from LED light source data sheets. Those will be in lumens/W. The lyx/W will depend on the optics in the light fixture, as that figure depends on how light is distributed in the light beam. You can have a fixture that will produce a narrow beam, giving many more lux than just the bare LED without any extra optics.



You must always verify the actual lux levels by measuring illumination in lux for a given light fixture at some fixed distance (say 1m), at various angles from the optical axis. From this you can get a good idea as to how the light fixture will illuminate a surface at other distances and off-axis angles. To do a good job you will always need to validate the number provided by manufacturers.

Answer 2

1 W Led Bulb

Answer 3

According to the link below:



1) A lab prototype white LED achieved 161 lumens per watt.



2) The most efficient available white LEDs tend to 80-100 lumens per watt (power across the LED).



3) Many commercial products for line voltage are 50 lumens per watt, presumably because this takes into account the ballast resistor etc.



Note that LEDs are usually rated in candela = lumen/steradian to take account of the directional nature of the output.



A standard incandescent household lamp is about 15 lumens per watt.

Answer 4

LED bulbs are efficient because the light output in lumens uses less electricity (Watts) than comparable other devices use to output the equiv lumens. if you compare wattage and lumens, you will see what i'm talking about. LEDs also run cooler because less wattage = less heat.