When i did a spectral analysis of the scanning CCFL of the Konica Minolta Bizhub 751 in the storage of Carmel hospital with my CD-R, i discovered that all of the mercury lines are missing (Only the terbium green phosphor emission appeared in the specturm. I didn't saw the yellow doublet and the green and the blue lines of the mercury). So I concluded that the lamp is mercury (HG) free.
Since xenon excimer is the only second option to produce a UV to strike a phosphor in a fluorescent lamp, i think that this lamp filled with an argon-xenon only, where the argon is to lower the starting voltage (Like the argon in the common argon-neon penning mixture), and the xenon is to produce UV.
This is the main reasons why this lamp have no run-up time.
Despite the use of xenon as the main UV source (Xenon considered less efficient than mercury in producting UV radiation), this lamp is as bright as a mercury contained CCFL.

Many gases make UV - even neon (and it is used in green neon lamps) and air (the nitrogen in air ?) - Which is one of the dangers of staring into welder arcs

Ash: Neon lamps of other colors, usually have an addition of other gas apart from the neon (Usually krypton or xenon), or an increased argon dosing in the ar-ne. Neon itself is inefficient at producting UV radiation.
Some green neon lamps (For example the one that lies in the on/off switch of the Rapid electric stapler in the storage of Carmel hospital), don't have any red neon emission in their spectra at all, but only the green phosphors emission, as they have pure argon. Green neon lamps with neon, shows the neon emission in their spectra, an its red color is usually also visible in the unaided eyes. They producing the UV with the addition of krypton or xenon or an increased argon dosing.