Looking at the top the ATBM is pretty much just a larger version of the ATBS. Only differences on top are the more closely spaced heatsinks on the ATBM and the 4-bolt fitter option on the ATBM. This one only has 2 bolts in use though, the other provisions are left untapped. Seems kinda silly to have a 4-bolt fitter with the two pairs that close to each other. Plus with the leveling steps you only need one anyway.
Thanks! These are *locally sourced* fixtures from the same place. One is from September 2016 (small one) and the other is from January 2017 (medium size one). Both are a nice 3000K color like incandescent or halogen. Much nicer than the sterile 4000K or 5000K LEDs out there, though the 4000K ones are nice on the freeway. Wouldn't want anything warmer than a 3500K in my neighborhood though.
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