Lumen (lm) is the unit for luminous flux, i.e. the brightness of a lamp. This information can be found on light sources as well as on luminaires with permanently installed LEDs.
Watts or lumens? - That is the difference
Watt provides information about the energy consumption, lumen about the brightness. The reason why people used to use watts to find out about brightness was that the ratio of watts to lumens (the so-called luminous efficacy) was always the same for incandescent lamps. However, as light sources are becoming more and more efficient (especially LED lamps), they now produce more and more lumens per watt. However, how many lumens a light source produces with how many watts depends on the product. Lumen is therefore a reliable value for determining brightness.
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The savings formula today is: more lumens - fewer watts. As lamps and light sources become ever better and more energy-efficient, they offer great potential for savings. Anyone choosing a new light source today will opt for LEDs - the most energy-efficient light source on the market.
Lumen (lm) is the unit for luminous flux, i.e. the brightness of a lamp. Light bulbs also had lumens, but it was customary to think in watts. This is no longer possible today because the ratio of watts to lumens is no longer regular with modern lighting technologies such as LEDs.
Where can I find the lumen specification?
The lumens are printed on all lamp packaging. It also provides a comparative value that helps when comparing the luminous flux with a conventional incandescent lamp. Both can of course also be found in the online shop Lights.co.uk.
How many lumens per square metre make sense?
This basically depends on the place of application and personal preference. If you like your rooms bright, you should orientate yourself on a guideline value of 100-150 lumens per m². Reading corners or quiet zones often look particularly cosy with fewer lumens or dimmed light. Only in professional lighting applications such as in public facilities, restaurants, hotels, schools, parks or supermarkets are brightness values regulated by standards and binding.
How do I compare lumens and watts?
Today, light sources are compared on the basis of lumen. If you want to compare LEDs & Co. with the wattage of light bulbs, you need to know how many lumens the old light bulbs had:
100 watts = 1521 lumens
75 watts = 1055 lumens
60 watts = 806 lumens
40 watts = 470 lumens
25 watts = 249 lumens
Modern light sources such as LEDs generate the same brightness with fewer watts - the luminous efficacy is higher. However, the ratio is very product-dependent and today ranges up to 200 lumens per watt for the latest generation of LED lamps with energy efficiency class A.
How do I convert to LED?
Beloved luminaires that were operated with incandescent lamps, halogen or energy-saving lamps can easily be fitted with a suitable LED light source. LED lamps have the same base as conventional lamps, e.g. E27, E14, GU10 or G9.
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