As an specialist in LED lighting, we are suprised at the misinterpretation of the the word EFFICACY. Be aware that many companies less experienced will simply quote efficacy as the lm/W figure based on the power which is consumed by the LED lamp. This gives false information and not a true representation of the ‘actual’ power being taken from the system. When we say ‘system’, we mean the inclusion of the actual AC/DC converter that takes the AC mains and turns it into a low voltage supply required to drive the LED circuit. There is no such thing as 100% efficient power supply, and most LED drivers have efficiencies ranging from around 75 – 85%.
When we quote our efficacy figures, we always take into account the ‘system’ power.
The higher the efficacy (lm/W) the better the lamp / luminaire in terms of the amount of lumens (lm) per Watt (W) of circuit power.
Stay clear of any products with an efficacy of less than 50lm/W (due to Part L Buiding Regulations)
