Too bright for the height...period. T5 is made for highbay applications.
The lights the OP linked to are T8's. The reflectors are made for highbay.
Beat me to it. Indeed, if you follow the link the OP posted, the I-Beam lights linked to are T8 lamps (they do make T5HO in this fixture, but these are not).
Lithonia is most likely correct, the reflectors are designed to focus the light in a more downward pattern. It will spread out, if the fixture is 20 ft up, but at about 5 ft from light to working height, the cone of light will be narrow, and create dark spots between the fixtures.
That I can tell, Lithonia no longer has a IB 632 MVH fixture on their web site. All of their I beam lights are now designated IBZ and there is no IBZ 632 MVH listed. IBZ fixtures are flat on top, the ballast is recessed in between the middle bulbs. The fixture most closely resembling the one in the HD picture is a FGB series, with a hump on top for the ballast. There are versions of the IBZ made for wide distribution of light, but still, 8 ft is probably too low for them. The easiest way to spot the different type of light distribution in Lithonia fixtures is that the ones with the highly polished aluminum reflector are the Narrow Distribution, focused light design, while the ones with the white reflector is the Wide Distribution. The slots above the bulbs provide for uplighting, and some fixtures are available without this.
I'm wondering if the ones HD has are an obsolete version of the I beam lights, the original version, which is, coincidentally, what all of their stores are equipped with.
Go
TO THIS LINK and click the "open" folder in the upper left. Then select "lithonia" from the menu. Then select "fluorescent and LED high bay". Then select "general purpose". Then select the light shown as IB, which is third row down, far left. Then use the scroll bar on the far left as needed to move the list. there are four different 6 bulb T8 fixtures listed, the IB632, the IB632NDS, the IB632WD, and the 632WDS. None of these are the MVH listed on the HD website. DOUBLE CLICK on the particular model you want to view the specs on for the full specs and light distribution graphs. A single click will give you a preview. On the far right you can select the PDF to display and print this.information in a user friendly format.
At the top of the screen you can select "interior" and plug in the dimensions and import the data from the light specs for the light you have selected and get a feel for what the lighting will do for you.
You can add different types of light fixtures by selecting the green plus sign and selecting from the main menu the light you desire to use, then it will recalculate. You can switch between the first and second and so forth as you add lights. I have twelve 400 watt MH lights in a 60x60 at about 15 ft and it shows I need 9, so I am over lit it appears.
ND is narrow distribution
WD is wide distribution
The S indicates vent slots/uplighting
Very late EDIT: the MVH stands for Multi Voltage and I think the H stands for High bay
Charles
