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The description says the Heatsink ring is Copper not Brass.
Please correct it if it is Brass. In my opinion Copper is much better material for heatsink than brass.
Hey @B.man thanks for noting this - apologies for the inconsistency, I've updated the copy and specs accordingly.
The ring is just the exposed part of the unibody circuit board, which is brass. The specific heat, which is a measure of the energy required to change the temperature of a given object (by one degree) for brass and copper are almost identical (0.386 vs. 0.380). Are there other properties of copper that you think make it more suitable for this application?
Thermal conductivity is the property to look at... specific heat tells you how much energy the material can absorb, but not how quickly heat can move through it.
Brass 115 W/m-K
So copper is better than brass in this sense, but copper is softer and more fragile so probably brass is the better overall choice. And this is based on an existing light so it must be a working design.
brass is a poor heat conductor, Copper is the best, Aluminum is 1/3 worse, and brass is 50% worse than aluminum
in practice the brass ring on Lumintop TiTools gets too hot to touch within 5 minutes of running on high mode. I mainly use medium, or low, seldom High. The runtime on High is very short, and falls quickly, as it is not regulated.