Does Arc-LS use electronics to keep the...

[Forge]

...the brightness of the light consistent like the Arc-LE does?

 

[Luff]

Yes

 

[WaltH]

One of the first things I did with my new LS the other night was put a 123 into it which was pretty well drained from my E2. The bulb ran about 3 hours in sun mode and another 1.5 hours in moon. Very respectible.