50000 lumen light12/11/2023 ![]() The replacement will need to happen sooner. If so the rated life shown of 50,000 hours may not apply. In these cases a 20% drop instead of 30% (L70) in lumen output may be the trigger for lamp or fixture replacement. However, different tasks or different space lighting requirements may be more sensitive to a decline in illumination. You may ask, why 70%? Studies have been done that show most people who work in a space do not notice there is insufficient light until the light level drops to around 70% of initial output. Remember, in most cases LEDs do not ‘burn out’, they simply get dimmer and dimmer over time. If a light meter is not used, the only alternative is to wait until the occupants start complaining of low light. If the specification sheet say an LED fixture has initial lumens of 29,000, then the likely fixture or LED light source replacement needs to happen when the light meter shows an average of 20,000 lumens in the space (29,000 initial lumens x. Here is an example of how a light meter is necessary for LED lighting maintenance. ![]() There is only one accurate way - with alight meter that shows lux (or footcandles) that can be converted to lumens.īefore LED lighting, light meters were likely rarely found in facilities. The LED light source may continue to emit light until it has been operating for 80,000 hours or more, but it will cease producing effective lighting at around 50,000 hours.Īs a facility manager, you may ask how do I know when the fixtures in a space drop to 70% of initial lumen output. ![]() L70 is an industry standard, meaning the lumen output has declined to 70% of the initial lumens.įor example, if you install LED troffers with a rated life of 50,000 hours L70, you should assume that the lumen output of most of the troffers will drop below optimal (70% of initial lumens) at around 50,000 hours of operation. When manufacturers of LED light bulbs and integrated LED fixtures list the rated life in the spec sheet, you will normally see the designation 'L70' next to the rated life. Instead of replacing lamps when they “burn out”, with LED, replacement needs to be scheduled before light output has declined to the point that it is noticeable to the occupants of the space. The graph represents a different maintenance challenge for facility staff. Second, the sudden drop to zero for incandescent, fluorescent and HID compared to the gradual slope down toward zero for LED. First, the slope of the line indicates declining lumen output, called lumen depreciation*, with increasing hours of operation. The graph below shows the typical life of different light sources. With traditional incandescent, halogen, fluorescent and HID light sources, end of life often meant when the lamp goes dark. However, facility managers should be aware at the outset of LED installations of the different requirements for maintaining and monitoring LED lighting compared to fluorescent, halogen or HID. With LED rated life ranging from 25,000 hours (for lamps) to over 50,000 hours (for fixtures) the typical time to replacement is measured in years. When LED fixtures (or lamps) are installed in a building, thinking about replacement is likely the last thing on the minds of staff.
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