How bad is 91W gear for an expensive 135W lamp? Testing SOX 135W on 91W, 135W and 135/180W ballast

Time to power up my most expensive lamp. Due to a wrong delivery, I have three power options to choose between.
In this video, I test and compare how well they light up the low-pressure sodium-vapor Philips SOX 135W lamp.
Which is better? The ballasts BSX 91, BSX 135 or the leak transformer L4135? One of them is not really meant for a 135W lamp, but it is the most modern and perhaps the best option? Let's find out in the most comprehensive test I have ever performed!

My Patreon-page:   / brainiac75  
Direct link to Patreon post with data files from the ballast tests:   / how-bad-is-91w-108923263  

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FULL MUSIC CREDITS
Time codes: 0m:01s + 3m:41s + 10m:54s
'Hiding Your Reality' Kevin MacLeod (incompetech.com)
ISRC: USUAN1700081

Time codes: 1m:01s + 12m:39s
'Perspectives' Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027

Time code: 6m:44s
'Fluidscape' Kevin MacLeod (incompetech.com)
ISRC: USUAN1100393

Time code: 7m:56s
'Ossuary 6 - Air' by Kevin MacLeod (incompetech.com)
Part from 2:34 into the music track.
ISRC: USUAN1500048

Time code: 14m:49s
'Adding the Sun' Kevin MacLeod (incompetech.com)
ISRC: USUAN1900041

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

Time code: 12m:10s
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 #ballast