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https://www.cree.com/led-components/media/documents/XLamp_PCB_Thermal.pdf
LED Design
Drivers:
https://www.digikey.ca/product-detail/en/texas-instruments/TPS61165DBVR/296-27597-1-ND/2340765
6 series LEDs are driven by a driver. Dimming/on/off is done with PWM using a 555 timer.