Thanks ImA4. Here is a link to the build thread. Not much response to it though, I guess worklights are not as interesting as flashlights
Now that you point out the heat spreaders I notice them.
Also, I have run those bulbs alongside of the versions with the heavy heat sinks. Each seem to run at about the same temperature after a few hours.
I have confirmed the 60W LED bulb in the twin pack for $3.98 with the 4.57 year lifespan is the same exact bulb as the 99 cent bulb with the 1.8 year lifespan. It is the same exact bulb inside and out.
That 99 cent bulb will be available again on Black Friday, probably at all the Lowes.