If your soil is good and PH is good than they can handle it.Its the heat they cannot.Seeds sprout outside under the most intense light twice as bright as anything in a grow room.I never understood why people say seedlings cannot handle lights.This is the most critical point of your plants life.Plants need light.Give it ot them and let them tell you how much they like it.Ive had seedlings before praying to 1000W Hids at 24 inches away.All my seedlings love lights
29 days from sprout 6 plants and a 45 x60 inch screen filled up in full bloom
Plants eat light for food.give it to them.they will let you know when its to much