Revision to Proposed Test Procedures for High-Intensity Discharge Lamps
The Department of Energy has issued a supplement to a December 2011 proposed rule that would establish test procedures for high-intensity discharge lamps to measure efficacy, color characteristics and lumen maintenance.
As initially proposed, the test procedures would include measurement of parameters to enable calculation of lamp efficacy (in lumens per watt) and would also provide for the efficiency measurement of directional lamps using center beam intensity (in candelas) and beam angle. The proposed procedures would also measure lumen maintenance (i.e., the fraction or percentage of lamp light output relative to initial output, over time) at 40% and 70% of rated lamp lifetime. Correlated color temperature and color rendering index would also be measured as potential means to delineate equipment classes for HID lamps.
DOE is now proposing, and accepting comments through June 23 on, the following changes.
- updating the industry standards proposed to be incorporated by reference
- revising definitions of “basic model,” “directional lamp,” “lamp efficacy” and “lamp wattage;” eliminating the terms “beam angle,” “lamp electrical power input” and “lumen maintenance;” and adding a definition for “initial lumen output”
- providing clarification and additional background information on ambient temperature conditions
- revising proposed ambient air speed requirements to eliminate as unwarranted an explicit air speed limit
- revising the proposed sampling requirements for sample size and statistical representation
- removing the directional lamp requirements and proposed lumen maintenance test method