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Torches are 10 meters, simple light bulbs 12, industrial light bulb and light 16, fluorescent is now 20 meters. Costs are 5w, 7 w and 10w. I didn't look at spot lights I thought they were adjusted to be ok in 17 but I can have another look.
Yes please do check them out, spotlights are one of those things I'd acquire and go to install late game on a big fancy base just to be super dissapointed by them. It's more than just their abysmal light output, is also super annoying to point them and try to find a way to not have them interfere and make huge shadows from their own geometry. So a big spotlight cast a wee lil light and blocked most of it with itself, especially if mounted high and looking down.
Watching you play, experience things first-hand, and make changes as a result, has been really fun btw. I've only been in the forums this much since A17 talk where you just mentioned you didn't do much if any playthroughs, looking back that makes a ton of sense, especially by comparison. Your presence in that forum was very different than it is this time, and the game is getting far better tuned this time as well.
Now that you're into electricity I hope you go looking for a solar bank to set your "late game" electrical system, that was always the peak for me, but I can never ever find the ■■■■ things in A17. Please go far enough to encounter this frustration so that those become less impossible to find, or make the ones in the wild wrenchable, something. I only used them in creative builds in A17, not once in an actual game, where-as they were a common goal, and achievement, in my A16 bases.