rated lamp life

rated lamp life

% rated lamp life vs. % of initial lamps which survive A life expectancy curve for incandescent lamps
1. The average life of a lamp of a given type, as determined from a large sample operated under laboratory conditions; the average life of a group of lamps which are operated under variable conditions may not equal the rated lamp life.
2. For lamp types whose luminous output drops to a very low value before the lamps cease to operate: the time when the output of a large sample of lamps under controlled laboratory conditions reaches a specified fraction of the initial output.
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In a group relamping program, all fixtures are cleaned and relamped at once, based on the predictable rated lamp life, just prior to the steep end of the failure curve.
The patented heat sink reduces fixture temperature for an unparalleled LED rated lamp life of 50,000 hours at 70 percent initial output.
Advantages for plant researchers over existing T12 and T5 fluorescent systems include energy savings up to 70 and 50 percent, respectively, greater average PPF tailored to the photosynthetic action spectrum, improved horizontal and vertical light uniformity, a dimmable ballast to adjust PPF output to 50 percent of maximum without uniformity or spectral degradation, and a 30,000-hour rated lamp life.
Each of the four fields that met this criterion had been operated for less than 900 hours, which is less than 30 percent of rated lamp life.
We support the IES recommended practice of designing lighting systems to meet the mean target illuminance at 70 percent of rated lamp life, and also to group relamp when that time-of-use has been reached.
Inspire offers high performance optics, wide uniform coverage and 50,000-plus hours of rated lamp life in a compact housing.
Producing 1600 lumens in an omni-directional light distribution pattern, the new ULTRA LED A-Line lamp provides up to 84 percent energy savings over traditional incandescent lamps, while offering excellent color rendering and a long rated lamp life of 25,000 hours.
The CFLs must endure one cycle for every two hours of rated lamp life, which means a 10,000-hour lamp must cycle for 5,000 hours.
Available in 320-, 350-, and 400-watt versions, the lamps have an average rated lamp life of more than 20,000 hours, feature a color temperature of 5000K and provide a color rendering index (CRI) of 90+.