Given the conditions in the roof area of industrial spaces, it's pretty tough to design an LED based light for that environment. Especially when the circuitry and LEDs need to be kept cool with forced airflow, which carries dust, moisture and bugs into the light.
Compare that to a high pressure sodium or metal halide bulb that runs hot as standard, and has a very simple power supply of a big fat inductor and maybe a low component count igniter circuit too.
This baked LED bulb came from a fibreglass insulation factory, so it contained an exciting mix of fibreglass, dust and bugs.
I'm not sure when the fan stopped being a fan, but it was seized solid with debris and rust, suggesting that humidity had been a factor too.
The PCB is interesting, as it is based on a power factor correction chip being used in a non standard way to create an isolated power supply with optically isolated feedback for regulation.
The LEDs had survived the ordeal, although their connection with the heatsink was a loose fit with an optimistic smear of thermal compound that was more wishful thinking than heatsinking.
The LED power goes to the end PCB which marshalls the power out to the six side PCBs. The end PCB has 13 LEDs in series and each side PCB has two 13 LED series circuits giving a total of 169 LEDs configured as 13 parallel strings of 13 series LEDs. the voltage is around 40V for the array.
I'll guesstimate a current of 1.5A for about 100mA per LED.
The heatsink is a work of art. A very stylish extrusion.
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