jlafferty wrote in post #18660556
Transfer of oils from your hand to the metal - I'm told - reduces lifespan. I could be mistaken. This is also just my general practice regarding bulbs and all electronics - don't touch exposed metal contacts.
This 'no oils' thing was particularly applicable to very high light and heat output bulbs of the incandescent/halogen type...like projector bulbs and halogen lights in home lighting or automotive applications. Modelling light bulbs fall into this category, too. The lamp is sensitive to oils left by the human skin, if you touch the bulb with your bare hands the oil left behind will heat up once the bulb is activated, this oil may cause an imbalance and result in a rupture of the bulb.
Xenon tubes in photographic speedlights or studio strobes do fall into this caution, per instructions from photographic lighting equipment manufacturers. Both Paul Buff and the Adorama Flashpoint replacement tubes carry this no-oils caution on tube life, for example.
If there is a protective glass surround which encases the flashtube, the same cautions do not apply.
Videos showing people installing/removing them bare handed is an example of the poor practices and or ignorant behaviors propagated thru web postings by the uninformed!