In Nevada, spotlighting predators was 100% legal and the standard practice.
While Nevada is certainly a very gun and hunter friendly state, your flat comment about spotlighting as stated is simply not true. Spotlighting in Nevada is legal, but not in all places, at all times or for all things. Department of Wildlife regulations, state laws, county laws and city ordanences all have bearing on when and where and for what spotlighting is as you say 100% legal - and they can vary widely from local to local.
Unfortunately you may get confilicting answers to what is and is not perfectly legal at a specific place depending on who you talk to at which office (a typical not all being on the same page thing). So the best plan to CYA is to check before you spotlight in NV with the local county ranger or county wildlife biologist AND especially the county sheriff where you plan to hunt, and record with who and when you talked to them.
Also keep in mind that Bobcat and Gray Fox can not be harvested by nonresidents anytime either hunting or trapping (only by residnts in season). Red and Kit Fox can in season with a nonresident license, so can Mountian Lion (considered big game) in season with nonresident license and tags. Coyotes and blacktail Jacks as non game species as well year-round with no bag/possession limits. The NDOW has a separate furbearer proclamation available for the asking.
In Nevada at least, no LE is going to differenciate between the spotlights themselves as to what is legal or not. I've used vehicle powered mounted and hand held spots as well as scope mounted battery powered spots here for many years hunting and doing ADC on predators where I have ran into LE's many times while out spotligting. None question the spotlights legality or mine - most just want to know how the hunting is going.
HTH,
L.