Lumen maintenance (original) (raw)
Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source. Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. Lumen maintenance is the luminous flux remaining (expressed as a percentage of the initial output) at any selected elapsed operating time. Lumen depreciation is the luminous flux lost over time, and thus the complement of lumen maintenance.
| Property | Value |
|---|---|
| dbo:abstract | Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source. Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. Lumen maintenance is the luminous flux remaining (expressed as a percentage of the initial output) at any selected elapsed operating time. Lumen depreciation is the luminous flux lost over time, and thus the complement of lumen maintenance. Lumen maintenance compares the amount of light produced from a light source or from a luminaire when it is brand new to the amount of light output at a specific time in the future. For instance, if a luminaire produced 1,000 lumens of light when it was brand new and now produces 700 lumens of light after 30,000 hours, then it would have lumen maintenance of 70% at 30,000 hours. Useful lifetime estimates for LED lighting products are typically given in terms of the expected operating hours until light output has diminished to 70% of initial levels (denoted L70 life). This percentage was favored because research indicates that most users fail to notice the slow loss of light until well after it passes the 70% mark. However, many lighting designers have pointed out that a 30% loss of light is pretty poor performance and some manufacturers have responded by providing L80, and even L90, data (that is, the life until the LED has lost 10% of its initial brightness). There are a number of methods for controlling lumen maintenance areas: * Installing photoreceptors tied directly to ballasts, controlling the voltage output to the lamps based on the set level of luminance. * Connecting dimming ballasts directly to an energy management system that has been programmed for the expected depreciation of the lamps; the energy management system directs the output of ballasts as necessary to maintain required lighting levels over time. * Manually verifying lighting levels in a space by using photometers in specific locations, and then manually setting the system to meet lighting requirements. (en) |
| dbo:wikiPageID | 40061686 (xsd:integer) |
| dbo:wikiPageLength | 7513 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1057523725 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Energy_management_system dbr:Lumen_(unit) dbr:Ballast dbr:Luminous_flux dbc:Lighting dbr:Photometer dbr:Illuminating_Engineering_Society dbr:Photodetector dbr:Luminaire |
| dbp:wikiPageUsesTemplate | dbt:Reflist |
| dct:subject | dbc:Lighting |
| gold:hypernym | dbr:Flux |
| rdfs:comment | Lumen maintenance is the most useful gauge to determine the lifetime or useful light output rating of an LED light source. Unlike traditional light sources such as incandescent lamps, LEDs rarely fail outright and instead continue to emit light, albeit at slowly diminishing rate over time. Lumen maintenance is the luminous flux remaining (expressed as a percentage of the initial output) at any selected elapsed operating time. Lumen depreciation is the luminous flux lost over time, and thus the complement of lumen maintenance. (en) |
| rdfs:label | Lumen maintenance (en) |
| owl:sameAs | freebase:Lumen maintenance wikidata:Lumen maintenance https://global.dbpedia.org/id/fABN |
| prov:wasDerivedFrom | wikipedia-en:Lumen_maintenance?oldid=1057523725&ns=0 |
| foaf:isPrimaryTopicOf | wikipedia-en:Lumen_maintenance |
| is dbo:wikiPageRedirects of | dbr:Lumen_maintenence dbr:Lumen_depreciation |
| is dbo:wikiPageWikiLink of | dbr:L70 dbr:LED_lamp dbr:Grow_light dbr:Lumen_maintenence dbr:Lumen_depreciation |
| is foaf:primaryTopic of | wikipedia-en:Lumen_maintenance |