Hello
@techs21 -- welcome to Roll It Up. A rule of thumb is 30-50 watts per square foot so you have 5,000 square feet times 30 watts per square foot equals 150,000 watts. So, if you decided to use the SPYDRX at 685 watts you would need 150,000 watts divided by 685 watts per light equals 219 lights
Say you qualified for a big order discount and each SPYDRx cost you $500 you would need $500 x 219 per light equals $109,000.00
Next, you might want to move to Oklahoma where electricity is cheap at 5-cents per kilowatt hour -- you know, to keep your costs down. 219 lights at 685 watts each on for 18 hours a day would cost you just about $300 per day.
Happy New Year!