These are LT date codes.
At LT the first 3 digits are the year leaving out the 0.
214 = 2014.
Beyond that it is a serial number and has no real meaning.
We can look it up in our computer system on when these were made and give you the actual dates.
We can trace back based on this all the components every one that worked on the lamp all the way back to the supplier of the glass or mount, filament, etc.