Patent ID: 9723669
Date: 2017-08-01
CPC Classifications: F21V,F21Y,H05B

Claim:
1. An LED lighting system comprising: a heatsink; a plurality of strings of LEDs each string comprising one or more LEDs each having a junction and being mounted on the heatsink, and a controller comprising a memory unit and a processor and being configured to supply a respective current to each of the strings of LEDs; wherein the processor comprises: a first temperature estimation subunit configured to generate a first estimate, being an estimate of the junction temperature of the LEDs of a one of the strings of LEDs; a heatsink temperature estimation subunit configured to estimate a temperature of the heatsink from the first estimate; and a second temperature estimation subunit configured to provide a second estimate, being an estimate of a junction temperature of LEDs of a second string of LEDs, from the estimated temperature of the heatsink.