I spent 700 on a light meter because I wrote to a bunch of light companies letting them know I was running a study and would be making a comparing high dollar lights to cheap amazon lights and asked them if they had a light to lend or donate to the cause. I explained they can write it off as promotional sales and it doesn't cost them a dime but they get free marketing from it. Some companies wanted a deposit, cali made me buy it but told me 90 day no question returns were accepted,some just wanted it back after then some companies such as luminpool let me keep the light. I didn't spend $80 on the light. I spent about $900 in equipment to test lights, equipment I also use to find the right levels of light for when I do remodels so it's not like I just bought it to test the lights. But since I have it, Now I can test every corner of a grow room and manipulate it to what is most efficient. This grow here has been a science project/hobby. I haven't paid for any of my lights. I will be getting 2 new fc3000's from mars hydro and those will be the first lights Ive paid for.