ppfd ppf you can only measure with very expensive devices, the price of which is 10 times higher than the price of your lamp, bro! So in home conditions, without special equipment, you won't be able to figure this out! You can measure the illumination (lux) in the cultivation area above the plant! Install a free app called "luxmeter" on your smartphone from the market, wipe your phone's screen well, and clean it from grease and dirt. The light sensor is located on the screen side, which often rivals individual lux meters. Check the illumination above the plant. During flowering, your girl likes illumination in the range of 20000-100000 lux. Adjust the lamp height so it doesn’t heat the plant to such shock states but stays above 20000 lux. Install the app, you'll remember me more than once, bro! It will be like a compass for you in lighting! 👆 Good luck, bro! ✊😇