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How long is the Hydrofarm 8" cool tube? I ask this because some sites state it's 19" total length and other sites state it's 24". Anyone have one to verify which is right? I'd like to know especially for mounting 3 of them stacked vertically. If they were 19" I could fit 3 in a 8' ceiling with...

Straight from the Hydrofarm site (for 8" Cooltube): Q: Should my HID lights hang vertical or horizontal for maximum penetration? A: Studies have shown that a horizontal positioned bulb and reflector unit will provide superior light penetration to a garden compared to vertical...