Organic Double Grape Autoflower

You can use alternative a lightmeter app. hold your phone in the hight of your plant. It works not perfectly but better then nothing

25k lux max up to 40k lux max on late veg. But start of with the 25 after 10-14 days. Your plant has another few days to go before needing more lux. 12-15k is all that's needed for seedlings 250-350ppf To 5-600 max fr veg & pre flower not beyond 1000 during fattening and 6-700 during ripening But as also said below DLI plays much more a role in autos Between 45-60k DLI throughout their lives increases in dli with same hrs builds big buds. So what's important for autos is to boost energy by extra ppf over the same amount of hrs from start 2 finish. How autos work.. Fems u need 12 but can do 13.5hrs on with 730nm IR used to change the photochrome. Good luck they look healthy and not leggy so I think maybe ur light is too high.. or perfect. Anyways looking goo