Yeah I've definitely had light burn with a blurple... I have an Advanced LED I still use occasionally...I push it close as I can to get the most I can out of it...so the 1st sign you'll see from blurple being too close/intense is bleached white bud tips...leaves will b affected next n not even so much really...just some weird tie dyed look n maybe some warping of its shape but the most noticeable thing will be the bleach white bud tips especially when the light is on it really stands out