I am constantly applying a loss for a CCT other than as tested by the imported IES file. I typically apply this loss in the UDF column and add an explanation in the Description cell. However, this does require an explanation and clarification; not to mention a wide Description cell. I would respectfully like to request that a loss factor option of CCT be included in the selection. Thank you, in advance, for your consideration.
Pardon me, but you are making inaccurate assumptions. I did not say I was making a random call on the loss factor, and I did not say I was not being provided the loss based on the actual chip from the factory. Many factories do not produce IES files on every CCT available. I simply would like a light loss factor option cell where I may enter a loss factor for CCT, just like LLD, that would automatically calculate and show as a cell in the schedule.
Given that there's no specific loss applicable for CCT (e.g. 3000K from 4000K, or 2700K from 5000K) since it can change from between chip models/brands/etc., I don't really see how you're making a call on what factor to use.
I'm also surprised that your supplier couldn't either a) supply you with photometry in the CCT version you require or b) supply Relative photometry rather than Absolute so that you can pro-rate the lumens.