Both are 4100K

The "Utility ones have 2500 lumens

The Garage and Basement ones have 2600 lumens



NO indication of CRI on either.  


All I can say is      

sounds like halophosphate /640 or similar

Even our T8 lamps have to have very high 80s CRI ratings now. 

Ash: The american fluorescent lamps uses types of phosphors with an unusually high CRI, that aren't in use in the european fluorescent lamps from the 80's, when the triphosphors were invented.
These phosphors are called deluxe halophosphors, because they are based on the halophosphors, but can reach as high as Ra8=95.

A /640 T12 gives about 2500Lm. i would expect less Lm from a deluxe tube

Are they 48" T8 25W? HD had the Philips equivalent of it for a while.
If so, it's an SPX41 coating which is RE80 4100K. CRI is 81-83 I think. 

Both are 4100K

The "Utility ones have 2500 lumens

The Garage and Basement ones have 2600 lumens



NO indication of CRI on either.  


All I can say is      

These are 32 watts. The Utility says SP41, though I bet the phosphors have been upgraded.