I bought these floodlights to examine because one has a very narrow beam angle (30 degree) and both had what appeared to be an extra heatsink on the back.
They are both quite well made and do run at 20W. One was earthed and one wasn't! Worse still, to earth it would require new termination of a cable, since the earth core of the existing flex was taken into a potted driver.
The beam difference is down to aluminium reflectors with common fixing points. The heatsink on the back is clamped in place through the housing with screws against a sealing gland. I'd guess that it's a modular approach that allows different depth extrusion sections to be used for differing LED wattages.
One light had a potted driver and the other's was just in heatshrink. I removed the heatshrink to reveal a decent looking driver with a standard switchmode driver chip by Fairchild (5L0380R) which is a self running fixed frequency driver with primary peak current sensing. Feedback was via a current sense resistor and single transistor threshold detector driving the LED in an opto-isolator. Quite a nice looking power supply. It also had a glass fuse on the input and what looks like a PTC thermistor for overcurrent protection.
Негізгі бет A look inside a narrow beam 20W LED floodlight. (30 degree beam.)
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