There are so many inaccurate and outrageous performance figures quoted by many in the LED Lighting Industry, most of which are never verified or tested by a UK or European Labs.
Many use bare board LED Lumens tested without power supplies and optical losses and state these bare board lumens even stating ‘up to 200 lumens per watt’ for example.
At BSS LED we have always used third party verified data to support our claims and been prepared to publish data to support all of our claims.
The 100w LED Low Bay [BSS LED Model Number 81001] has been tested as a complete luminaire by the UK Lighting Industry Association Labs in Telford and produces 141 lumens per watt.
How do LED Luminaire lumens compare to LED Board Lumens?
To enable us to demonstrate the difference between LED Board Lumens and Luminaire Lumens, we conducted a test of the LED Board in a certified lab in Australia, LED Lab and using a Direct Current power supply, tested the bare board in an integrating sphere recording an efficacy of 179 lumens per watt [Notably 10 lumens per watt lower than the manufacturers claim].
Estimating the electrical losses through the LED Driver to be approximately 10%, the lumens would reduce to approximately 160 lumens per watt.
The difference between the recorded 141 lumens per watt and the 160 lumens per watt can be reflected in the optical losses or a slightly higher electrical loss.
The 100 watt LED Low Bay was not fitted with a clear diffuser which would potentially reduce the lumen output by another 10%. The wider the beam angle the more reflection within the luminaire and the great the lumen loss.
In summary, electrical and optical losses will account for 20-30% from the bare board lumens, therefore anyone quoting a luminaire output of 170 lumens per watt is suggesting that the bare board lumens are actually in excess of 220 lumens per watt. Whilst this efficacy is perhaps possible, we wonder why so many companies are unwilling to disclose any data or hide behind a generic Far East test report.