I don't want to take credit for this, it is from @SupraSPL 's thread titled CXB3590 1500W on page 2 half way down....
@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A (49W ea) $190
(1) HLG-185H-C1400 $65
196 dissipation W -> 85.7W heat ->
passive cooled heatsink 10284cm² -> 5.88" X 38" heatsink $72...