Sorry you didn't have any luck with them.
We've been running them in our at work for about 3 years, with no issues. But that's in a heated and cooled building.
For reference my shop is 20 x 28. Here is what mine looks like... you really can't tell how bright it is... but it's bright!
I used 8 lights total. 2 8ft lights connected together, then an 8 ft light across the rafters, then 2 8ft lights connected together then a single 8ft light... I used...