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Autos don't care about light at the dark time whereas Photoperiods get messed up with the smallest amount of light during their dark time.
Light burn with LEDs is nearly non-existant. You have to exceed 2500 PPFD to even begin to get a burn. What really happens is the LED light is so efficient that the plants will begin to grow very rapidly. When this happens the plants pull in a lot of water and nutrients. If the nutrients in the pot are building up (usually about the time the plants start to flower) then the plant pulls in too much fertilizer with the needed water and the plant gets a nutrient burn or lock-out. People attribute this to light burn but it is not it is nutrient burn.
Light burn with LEDs is nearly non-existant. You have to exceed 2500 PPFD to even begin to get a burn. What really happens is the LED light is so efficient that the plants will begin to grow very rapidly. When this happens the plants pull in a lot of water and nutrients. If the nutrients in the pot are building up (usually about the time the plants start to flower) then the plant pulls in too much fertilizer with the needed water and the plant gets a nutrient burn or lock-out. People attribute this to light burn but it is not it is nutrient burn.