MY LIGHTS ARE THE SHIT, DUAL SUN SYSTEM 600HPS AND 400 MH WITH HORILUX SUPER BLUE AND SUPER HPS BULBS. AND I STILL GOT HUGE SPACING. AND YEAH, IVE GOT AN AIR COOLED HOOD HOOKED TO A BLOWER. I WAS STILL GETTING LEAF BURN WITH THAT HOOD WHEN I WAS WITHIN A FOOT. SO GENETICS PROBLY HAS A LOT TO DO WITH IT. DUDE, LESS THAN AN INCH IS FUCKEN GREAT, YOUR GOOD, I MEAN HOW CLOSE COULD THE POSSIBLE GET?I wouldn't have any idea what normal would be. it's directly related to how good you light is.