Having efficient light bulbs is great. It saves energy which gives you lower electricity bills and lower impact on the environment. So why have we stopped using the very energy-efficient low-pressure sodium vapor lamps?
In this video, I take a closer look at this vintage technology and compare it to modern, state-of-the-art LEDs. How do they compare in luminous efficacy and color rendering index?

My Patreon-page:   / brainiac75  

Recommended videos:
Crazy difference between 5W LASER and 5W LED!:    • Crazy difference between 5W LASER and...  
Yellow Lasers?!? Finally - after 25+ years of collecting!:    • YELLOW LASERS?!? Finally - after 25+ ...  
LASER underpowered by its power supply? | First TTL/PWM Arduino attempt:    • LASER underpowered by its power suppl...  
Did you miss one of my videos?:    / brainiac75  

FULL MUSIC CREDITS
Time code: 0m:01s
'Long Note Two' Kevin MacLeod (incompetech.com)
ISRC: USUAN1100420

Time codes: 1m:00s + 7m:43s
'Perspectives' Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027

Time codes: 1m:51s + 9m:57s
'Fluidscape' Kevin MacLeod (incompetech.com)
ISRC: USUAN1100393

Time code: 5m:01s
'Lightless Dawn' Kevin MacLeod (incompetech.com)
ISRC: USUAN1100655

Time codes: 5m:37s + 11m:30s
'Ossuary 6 - Air' by Kevin MacLeod (incompetech.com)
Parts from 0m:00s + 2m:34s into the music track.
ISRC: USUAN1500048

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

Time code: 7m:18s
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

#SOX #LPS #lamp