Hashyanswered grow question 3 years ago Hi I think your diary said your about 40cm above the canopy. If the light is on 100% power is probably getting to intense a light. A phone app called photone is a good way of checking what levels your plant likes and doesn't like. Try lifting the light or reducing the power until the app reads 20 dli if it was higher then 20 dli its from the light. Also when using LED the plants use a bit more calcium and magnesium. Hope this helps.