Times change. Looking at lighting a new pole barn, I found myself looking at 250W high bay LED lights, which put out about 33,000lm. These are more efficient than many existing LED lights and the cost (Dec 2020) is about $115.00. Furthermore, they are dimmable, which means that I can use a lower intensity when I am not doing detail work.
Four units will more than adequately cover my 40x60x16 foot pole barn.
Since we get sub-zero temps in the winter, the temperature range of the lights was important, and these are rated from -22F to +130F.
Additionally these are used for outdoor lighting are similar to parking lot and street lighting.
There are different dispersion angles, and a 120 degree angle may work better with a 12 to 16' height. 90 degree are normally used with higher ceilings, such as 25'.
My recommendation is that when looking for effective lighting for a pole barn LED high bay lighting be considered. Technology has changed since the OP posted this, and it was answered.