Vertical Cool Tube Coverage?

How much area would a 600 watt vertically hung cool tube cover. Would it have the same penetration at 360 degrees as a horizontally hung bulb? So about 2’ of usable light penetration from the bulb all the way across? It would be in the center of an 8.5’ x 8.5’ room with 4x 600w horizontally hung bulbs.

Vertical bulbs work most efficiently in vertical grows. If you’re doing a horizontal grow, you don’t want light on the walls, you want it directly down on the leaves.

I’ve heard a lot of vert cultivators saying they don’t bother with cooltubes, just use an upward pointed fan. Heat rises so it works easily enough without