Are cheap UV detection cards any good?

How do you spot ultraviolet light? A cheap way is UV indication cards but is a cheap way a good way? In this video, I test three different indicators with six different lights.
I also show how it is possible to use the cards to test if your glasses have UV protection. Including potential misreads depending on the light source used.

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FULL MUSIC CREDITS
Time codes: 0:01 + 10:06
"Long Note Three" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100424

Time code: 0:51
"Lightless Dawn" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100655

Time code: 4:55
"Neo Western" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100615

Time codes: 5:53
"Perspectives" Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027

Time code: 7:46
"Energizing" Kevin MacLeod (incompetech.com)
ISRC: USUAN1900040

All music above licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/b...

Time code: 7:16
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 4.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100653

#UVdetection #UVprotection