Sampling Plan. DOE is proposing a sampling plan for determining input power, lumen output, CCT, and rated lifetime of an LED lamp. DOE reviewed the sampling requirements of other lamp technologies to develop the sampling plan for LED lamps. For testing LED sources, DOE reviewed the requirements specified in IES TM–21–2011 and identified that those requirements are necessary to project the rated lifetime. ▇▇▇ proposes a minimum of 21 LED lamps should be tested for determining the input power, lumen output, and CCT as described in section III.B. A minimum of three lamps should be selected per month for seven months of production out of a 12 month period. If lamp production occurs in fewer than seven months of the year, three or more lamps should be selected for each month that production occurs as evenly as possible to meet the minimum 21 unit requirement. The seven months need not be consecutive and could be a combination of seven months out of the 12 months. Sample sizes greater than 21 should be multiples of three so that an equal number of lamps in each orientation are tested. This selection of a minimum of 21 lamps is consistent with DOE’s regulation for GSFLs and GSILs, specified at 10 CFR 429.27, Subpart B, which specify a sampling size of a minimum of three lamps for each month of production for a minimum of seven months (not necessarily consecutive) out of the 12 month period, totaling a minimum of 21 lamps. DOE further proposes that the input power, lumen output, and CCT of the units should be averaged and the value of each of these parameters should be rounded as specified in section III.B.5. The average value of each parameter should be calculated using the following equation: rated lifetime is determined by testing a different device (the LED source) and the proposed method for projecting lifetime provides specific projection calculations based on sample sizes outlined in that IES TM–21–2011. DOE requires that the same number of units should be tested at each case temperature for projecting the rated lifetime. ▇▇▇ invites interested parties to comment on the appropriateness of adopting section 4.2 of IES TM–21–2011 for the required sample size for rated lifetime testing.
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Sampling Plan. DOE is proposing a sampling plan for determining input power, lumen output, CCT, and rated lifetime of an LED lamp. DOE reviewed the sampling requirements of other lamp technologies to develop the sampling plan for LED lamps. For testing LED sources, DOE reviewed the requirements specified in IES TM–21–2011 and identified that those requirements are necessary to project the rated lifetime. ▇▇▇ proposes a minimum of 21 LED lamps should be tested for determining the input power, lumen output, and CCT as described in section III.B. A minimum of three lamps should be selected per month for seven months of production out of a 12 month period. If lamp production occurs in fewer than seven months of the year, three or more lamps should be selected for each month that production occurs as evenly as possible to meet the minimum 21 unit requirement. The seven months need not be consecutive and could be a combination of seven months out of the 12 months. Sample sizes greater than 21 should be multiples of three so that an equal number of lamps in each orientation are tested. This selection of a minimum of 21 lamps is consistent with DOE’s regulation for GSFLs and GSILs, specified at 10 CFR 429.27, Subpart B, which specify a sampling size of a minimum of three lamps for each month of production for a minimum of seven months (not necessarily consecutive) out of the 12 month period, totaling a minimum of 21 lamps. DOE further proposes that the input power, lumen output, and CCT of the units should be averaged and the value of each of these parameters should be rounded as specified in section III.B.5. The average value of each parameter should be calculated using the following equation: DOE proposes that the sample size for testing LED sources for determining the rated lifetime of LED lamps be as specified in section 4.2 of IES TM–21– 2011. This section recommends that all data from a sample set at a given case temperature and drive current from the LM–80–2008 test should be used for projecting the lifetime of the LED source. The recommended sample set is 20 units for projecting the lifetime of the LED sources. If at least 20 units are used, the lifetime could be projected up to six times the test duration, with a maximum limit of 25,000 hours as described in section III.C.7. If the number of units tested is between 10 and 19 units, the lifetime could be projected up to 5.5 times the test duration, with a maximum of 25,000 hours. Less than 10 units cannot be used for the IES TM–21–2011 projection method. This requirement is different from the sample size proposed above for testing the LED lamp to determine input power, lumen output, and CCT. The differences are primarily because the rated lifetime is determined by testing a different device (the LED source) and the proposed method for projecting lifetime provides specific projection calculations based on sample sizes outlined in that IES TM–21–2011. DOE requires that the same number of units should be tested at each case temperature for projecting the rated lifetime. ▇▇▇ invites interested parties to comment on the appropriateness of adopting section 4.2 of IES TM–21–2011 for the required sample size for rated lifetime testing.
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