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installing fixtures with different lumen outputs

jives

Well-known member
Joined
Jan 4, 2013
Messages
2,811
Location
Central NY
Hi all:

I am wondering the lighting effectiveness of installing fixtures that have different lumen outputs. Here is the situation. My 32 x 42 garage has a vaulted ceiling, about 20' at the ridge peak and 14' sidewalls. If three rows of lights were installed, the outside rows would be at about 16' high, and the center row hanging at about 19'. The center row is on one switch, the outside rows on another switch. Let's say I install in the center row three 20,000 lumen output linear high bays, and the outside rows install three 12,000 lumen output linear fixtures, would that cast weird light? This may be more complicated is I install three fixtures in the center row, and 4 fixtures on the outside rows. The 4 fixtures may better enable basketball shooting.

The goal here is to turn on the center row of fixtures for general work, and a combination of only the outside rows, or all fixtures, for detailed work.

Thoughts?

Basketball Barn 1.jpg

GarageSideView.jpg
 
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Mesozoic

Well-known member
Joined
Oct 8, 2012
Messages
213
Location
Tucson, AZ
Load it up into Dialux evo and see what it shows. My gut feeling is that it's too bright, but as long as all the lamps have the same the color temperatures I would expect it to look nice.

For example, with my 14' ceiling in one area of the shop, I'm using 13,000 lumen high bay UFOs. For an adjacent 9' ceiling section, I'm using 3300 lumen units at the same color temperature. Dialux evo calcs show that the 14' area is getting 75-100 fc, which is totally overkill. Even the 9' section is getting 50-75 fc, also overkill.
 
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