You're right of course, I am following yours' and Mars's recommendations and raised my lamp to 18in above my ideal plant canopy - to not follow advice from people who make and use this kit would be nuts. Thank you for the advice - I really could have damaged my plants without it."You'll shoot your eye out!"
If you're lucky it will bleach out your plant. I understand different heights of your girls. I've made stands to elevate my shorter girls.
It's your grow, but too close will eventually bite you in the butt.
Being too close will give poor coverage towards the edges of your tent also/

