Great question.
I think it would be very difficult to compile said database accurately. Even just choosing one Make and Model could at times be difficult. Manufactures listed specs sometimes aren't even accurate as to what they are currently selling. Not to mention there are sometimes 3 or more versions of the same model, and they can have changes midway through production. Constant led and driver updates and so forth. Just having a variation in LED tint bins can make a light totally different in output appearance.
If you want to compare a few lights, I suggest posting those models and seeing what members have to say.
Good luck.