AGSR tries to answer the ....
Why are the LED Lights so expensive? A very good question so maybe this will help answer it. The amount of heat given off by the HPS is much higher than the LED lights. This will keep the grow tent, box, room at a cooler temperature. Maybe about 25 to 30 degrees. You will be watering less and that means using less nutrients . Why because the room temperature has been reduced. With less electricity, water, nutrients, and always replacing the HPS Grow Lights (The LED will last about 10 years) will save you money in the long run.
So, You will have a increase in your yield of crops, spend less on Grow Lights and save energy costs. I think that the LED Grow Lights is the right way to go.