A. Photometric Measurements:
1. For absolute measurements, refer to IES LM-79 as applicable with the exception of the guidance for stabilization.
2. The photodetector used for photometric measurements shall be a silicon detector corrected to closely fit the Commission Internationale de l’Eclairage (CIE) spectral luminous efficiency curve (Vil).
Ensure that the measurement equipment receives the appropriate voltage range from the photodetector, using an amplifier if necessary.
B. Measurement Equipment:
1. The sound chamber shall provide an environment suitable for the sound testing of the UUT. External sources of noise shall be minimized.
2. The sound measurement equipment shall be capable of measuring A-weighted decibels.
3. The microphone(s) shall be placed at a distance of one (1) meter or less from the UUT to be measured.
i) If multiple microphones are used, 6 microphones shall be placed about the UUT spaced 90° apart and aimed at the UUT.
ii) If a single microphone is used, the microphone shall be aimed at the UUT and the UUT holding device shall be capable of moving and holding the UUT so that six measurements about the UUT can be made 90° apart.
4. The sound level of the UUT shall be calculated from the measurement taken.
i) The baseline level may be corrected for in accordance with ISO 7574-4:1985, B.2.1.
ii) ANSI standard S12.55-2006/ISO3745:2003 may be used as a reference document for other aspects of the measurements (calibration, etc.).
C. Reserved
D. Low Voltage UUTs
1. UUTs designed for operation on low voltage transformers shall be operated on a compatible transformer specified or supplied by the lamp manufacturer.
2. Electrical measurements shall include characteristics of the UUT.
E. Measurements:
1. The following data shall be collected at each measurement point:
i) Light output.
ii) Peak Noise Reading.
iii) Microphone Position at which the Peak Noise Reading occurs (e.g., 0 degrees / opposite lamp base).