#10 How many lights and what wattage do you recommend for my pole barn?

[Sarah]

I have a 21 X 48 pole barn. I will be hanging them at 13'-14' high.  
Thank you!!

[Alan]

Normally, I recommend you use 6 pcs 100watt lights, 2 rows of 3 lights. But if you need to work or see details in your pole barn, I suggest you use 8 pcs 100watt lights, 2 rows of 4 lights.