Humm Too Cool (or maybe too hot?) 
.
Random thoughts:
High Performance Potting Epoxy
Samsung INR18650-25R for the US post number #12
and maybe liquid cooling? Cells/driver/emitter hay who knows?
Cree.com / LED Components / Products / XLamp LEDs / CXA3590 XLamp CXA3590
High lumen output and efficacy from a single, easy-to-use LED array
The XLamp CXA3590 LED Array delivers high lumen output and high efficacy in a single, easy-to-use package that eliminates the need for reflow soldering. Optimized to simplify designs and lower system cost, the CXA3590 LED Array can deliver system-level performance of 10,000 to over 16,000 lumens, enabling very-high-lumen-output applications such as high-bay and metal-halide replacements.
Compare CXA LEDs
SpecificationsVariationsDocumentation Multimedia Data Sheet (pdf)
Size 34.85 x 34.85 x 1.7 mm
Product Options 36 V
77 V
High-CRI
Maximum Drive Current 1.8 A
Maximum Power 150 W
Light Output Range 10000 - 18000 lm
Light Emitting Surface (LES) 30 mm
Typical Forward Voltage 77 V @ 1.2 A (85°C)
Viewing Angle 115 °
Binning 85°C
ANSI (White)
2- and 4-Step EasyWhite®
RoHS Compliant Yes
REACH compliant Yes
UL recognized Yes - Level 4 Enclosure Consideration
Package Size 34.95 x 34.95 mm