Illustrative Performance Metrics and Test Results

Goal: To conduct field research and demonstrations involving off-grid LED systems.

  • Granderson, J., J Galvin, D. Bolotov, R. Clear, A. Jacobson, and E. Mills. 2008. "Measured Off-Grid LED Lighting System Performance." Lumina Project Technical Report #4. [PDF]
Performance Metric Observed Min Observed Max Max/Min
Power (Watts) 0.13 1.51 11.6
Light output (lumens) 3.3 38.1 11.5
Luminous efficacy (lumens/watt) 8.2 53.1 6.5
Correlated color temperature (K) 8,528 31,069 3.6
Color rendering index 80.2 91.0 1.1
Maximum illuminance 24 200 8.3
Maximum beam candlepower 7.6 244.0 32.1
Luminance (cd/m2) 12,399 758,712 61.2
Daylight glare index (direct view) 23 32 1.4
Optical losses (%) 7.6 24.0 3.2