Those compact specialty metal halide lamps pack some serious power in their short arc! More so in those HTIs than in other "standard" HMI/MSR lamps as they are designed for maximum arc luminance at high dissipated power. If I'm not mistaken (I have the /75 7500 K variant of this lamp) the model shown here has a 4-mm arc length and features an interesting dysprosium-iron halide fill chemistry (with hafnium halide if yours is a /60 type) in order to cope with the lamp's extreme power load (about 150 W/mm). In comparison, a standard MSD 700W has an arc power load of ~70 W/mm, less than half that of the present HTI.

Iron halide is not an additive found in usual MH lamps, it is more commonly used in short-wave sources as this is an efficient UV-A radiator, especially in the 358-388 nm range. In modern HTIs (earlier ones used a Cd-Li-Ho halide mix) iron halide is an effective broad-band source of visible light at the very high arc temperature of the lamp, with little optical emission at lower temperature around that arc, which is a very important characteristics for those high-luminance sources which require a small, well defined luminous arc. So, watch out for UVs, its flux is bound to be quite significant with this particular lamp, even at full regime!

Thanks for the UV-A warning Max and interesting background to this lamp. It certainly runs hot going by how brightly the electrodes are glowing at switch off.

Also, be extremely careful even if you place a UV-block protective (lexan, plexiglass) plate between you and the lamp, that particular HTI has the highest arc brightness (60 kcd/cm²) in its category! Remarkably, this lamp has photometric properties (output, luminance) that nearly match those of the 1600 W XBO xenon short-arc lamp (60 klm, 65 kcd/cm²), so take the necessary precautions with your eyes. An additionally remark from your description, your HTI certainly requires forced air cooling indeed.

Definitely under running it and only for a short time. No sunburn or arc-eyes detected so far

Good. Better be on the safe side with those lamps, although its always nice seeing the full extent of what they are capable of.