Naturally, the lumens are bright and strong. However, from the perspective of lighting, it depends on the color rendering. Color rendering is related to the spectrum of light
Lumens is the total light output of an object. A 60 watt incandescent equivalent or a 10 W actual power LED put otu about 760 lumens for reference. That’s about 15 times more light brightness than a 50-lumen source. Your average small flashlight puts out about 50-150 lumens, so it’s not a lot.
Lumens is not a measure of brightness it is the total light output from a light source. Brightness is a measure of how much light is emitted from how much area into how much solid angle. The units of brightness is called nit and it can be calculated by dividing the number lumens by the product of area of the light source in meters squared times the solid angle the light is emitted into measured in radians.
This sounds complicated however think of it this way. Lumens is like the amount of water spraying out of a hose per second. The force of the stream is the brightness. If the water flows out of a small nozzle it has more force than if it dribbles out the end of a big pipe.
You can take that stream of water and focus into a tight powerful jet or let it spray out in all directions as a mist. The diameter of the outlet is the area of the light source and the width of the emitted stream is the solid angle.
A tight stream has a low solid angle and a mister has a large solid angle. If light is emitted in all directions it is covering a solid angle of 4 pi.
If it is focused to something like a laser beam the solid angle could be very very small. So you can have an extremely bright 50 lumen pin point laser beam or a very dim 50 lumen balloon globe light.
How bright something will appear is dependant on not only the number of lumens emitted but on the area the lumens come from and how much they spread out when they come out.
How well an area is lit can be measured with the unit lux calculated by dividing the number of lumens by the lighted area in meters squared. Direct sunlight is about 100,000 Lux, Daylight is 10,000 Lux, Overcast day or office lighting 1000 Lux, Dusk is about 100 Lux and the Minimum light needed for night time visibility is 3 Lux.
So with 50 lumens you could light an area about the size of a sheet of paper with the same light level of a cloudy day. Or something the size of a desk at the light level at dusk. Or light a 4×4 meter room so its visible enough to move around in.
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