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Converting Watts into Lumen: let's illuminate you!
What are lumens?
Lumen (lm) is the unit of measure for luminous flux. The lumen value measures the amount of light emitted by a lamp. The term "lumen" is Latin and means "light".
Anyone still looking at watts when deciding on buying a luminaire, will most likely be left in the dark. The one measurement that counts in modern LED lighting technology is lumen – a unit of measure that much better describes the brightness of a lamp than its watt value.
Converting watt to lumen
No problem if you are having a hard time getting away from the more familiar idea of watt. The watt to lumen conversion is easy. So... how do you go about stepping out of the dark and into the light? Here is an easy rule of thumb to follow:
Conventional wattage x 10 = lumen value
Lumen is a more precise measurement for the brightness of a lamp than watt.
What is the difference between omnidirectional lamps and reflectors?
The lumen value (lm) indicates the luminous flux or the total amount of light emitted by a lamp. The type of illuminant, i.e. omnidirectional lamp (bulb shaped) or reflector lamp makes no difference.
The brightness of omnidirectional lamps and reflectors is, however, calculated on a different basis: