Place your hand palm down on top of your tallest plant. If you can keep your hand under there for 2 minutes and the back of your hand does not burn, you can lower the light as continue to do so until it just begins to feel uncomfortable after 2 minutes. Now, if that causes your leaves to start doing the upward curl, then raise a couple of inches and continue doing so until the leaves settle down. However, they will still seem to be reaching for the light and that is normal. Good luck! Take care and be well....