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https://www.cree.com/led-components/media/documents/XLamp_PCB_Thermal.pdf
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LED Drivers
Candidates:
http://www.ti.com/lit/ds/symlink/tps92830-q1.pdf (has multiple channels, but low efficiency)
https://www.digikey.cacom/product-detail/en/allegrotexas-microsystems-llc/A8518KLPTR-T/620-1658instruments/TPS61161QDRVRQ1/296-25235-6-ND/50127042175022 (multiple channelsone channel, boost, driving current is a bit low)https, very simple, could be too small to solder)
http://wwwww1.digikeymicrochip.com/product-detaildownloads/en/texas-instruments/TPS61161QDRVRQ1/296-25235-6-ND/2175022 (one channel, boost, very simple/DeviceDoc/AT9917-Automotive-LED-Driver-IC-with-High-Current-Accuracy-Data-Sheet-20005557A.pdf (larger, boost, but very complex)