I'm building an LED grow light for an, um, indoor vegetable garden, and I'm trying to figure out what dimensions I can get away with for the aluminum sheeting I'm going to use for the mounting plate. I've been trying to use this heat transfer calculator, but unfortunately the physics is a little above my head.
I will be using 11 high intensity LEDs (data sheet), wired in series running at 700 mA. Due to build constraints, I plan to use an aluminum sheet that's 12" x 5", 1/16" thick (0.30m x 0.13m, 1.5mm thick). So that works out to a surface area of 60 [sq in], but the manufacturer recommends at least 9 [sq in] per LED (thus 99 [sq in] total for this project), so I'm significantly under that.
TL;DR - Here's the question - I have an aluminum sheet 12" x 12", 1/16" thick, if I cut it in half, and then use thermal epoxy to bond one half on top of the other, would that sufficiently increase the heat transfer capacity of my heatsink? Sorry if this is a dumb/obvious question, I really should have paid more attention in physics class :)