Why must halogen lamps always be used with a piece of glass in front of them? Because they are hot to the touch running hotter than ordinary incandescent bulbs?
Yes, but the heat causes other, less obvious, even invisible issues that you need to be aware of. Issues that the glass protects you against.
In this video, I take a closer look at them.

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FULL MUSIC CREDITS
Time code: 0:01
"Darkness is Coming" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100584
Intro part looped by me.

Time codes: 0:48 + 5:13
"Energizing" Kevin MacLeod (incompetech.com)
ISRC: USUAN1900040

Time codes: 1:48 + 9:36
"Long Note Three" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100424

Time code: 3:08
"Perspectives" Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027

Time code: 7:02
"Lightless Dawn" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100655

All music above licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...

Time code: 6:33
Mix of two tracks:
1) The Shimmering by fran_ky (freesound.org/s/237363)
Licensed under Creative Commons 0 license
2) "Spacial Harvest" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100653

#Halogen #LED #Ultraviolet