I agree with rovineye and abrightwell. it’s all about the watts, not the voltage. plus, anytime you do a conversion (from 12v to 5 v, from 12v dc to 120v ac etc) there is an inherent loss of energy. stick to 12v led lights etc and you’ll be fine.
if you plan on taking a TV along, there are some smallish LED tv’s (21-23″) that are 12v and come with 120v to 12v power supplies, like you use with your laptop. go to your favorite big box store and look at the backs of the small tv’s. I’ve checked recently and Samsung and LG tv’s are mostly 19v, but some of the off-brand small tv’s re 12v. I have a couple of 23″ LED tvs and they are rated at only 22 watts. you can then build a cord with a cigarette lighter plug on one end and the right size power jack on the other end. that would eliminate the inherent loss when using an inverter to convert battery power to 120v AC. of course, if you’re camping where you have shore power, not an issue.