Regardless of whether or not they are using a reflector type lamp to provide the distribution, they should have the IES files. How in the world do they know how well it does what it needs to do without that?
That being said, if you can find out the lamp part number you should be able to get a...
Yes, very much about the cow.
Essentially the basic requirements limit air flow from room side to the plenum and what materials may be plastic. There are exceptions. Fixtures must be submitted and approved for CCEA (City of Chicago Environmental Air).
I'm not aware of any other cities having...
From a component standpoint, there shouldn't be any reason a 3 lamp fixture costs more than a 4 lamp fixture when it comes to T8. Actually, the 4 lamp should be slightly higher given the extra sockets and labor for wiring. A 3 lamp ballast is the same price as a 4 lamp ballast (at least from...
