1. Greater than unity.
2. Less than unity.
3. Always more than unity.
4. Normally more than unity.
2. Less than unity.
3. Always more than unity.
4. Normally more than unity.
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S.NO | Absolute Photometry | Relative Photometry |
1 | Total lumen output of a luminary (bulb with fixture) | Total Lumen output of a bare lamp is measured. |
2 | Method used to measure LED performance. | Method used to measure Bare bulb and system performance. |
3 | Output is relative to an easy measured condition. | Output is measured in calibrated units under specific operating and environment conditions, ambient temperature, input voltage and orientation. |
4 | Specific lamp performance does not matter, | Lamps and system performance matters. |
5 | Use for SSL products | For NON SSL products |
S.NO. | PRODUCT | Testing as per standard |
1. | LED Tube Light | Test to be conducted under LM 79: a. Measurement of Total Luminous Flux & Luminous Efficacy b. Color Characteristics (Chromaticity Coordinates, Correlated Color Temperature & Color Rendering Index) c. Light Intensity Distribution Test |
S.NO. | PRODUCT | Testing as per standard |
1 | LED Batten | Test to be conducted under LM 79: a. Measurement of Total Luminous Flux & Luminous Efficacy b. Color Characteristics (Chromaticity Coordinates, Correlated Color Temperature & Color Rendering Index) |