they do not need light meters in most cases, in case of annoying blinding hid\led kits all they need to do is pop the hood, and see bulbs that are not oem
As far as I can see it, that is never, ever going to happen. LEOs aren't going to go poking around under the hoods of cars after dark, and even if they were, in many cases bulb access requires a whole lot more than just opening the hood (like: remove bumper, remove underhood components, sometimes remove the headlamps, etc).
However, you're right that traffic police don't need light meters. What they need is (1) enforceable, up to date laws and (2) infrastructure, by which I mean state-sanctioned (authorized, approved, accredited, however the state would want to do it) headlamp inspection stations. Officer has reason to believe the headlights are improper, writes a ticket. Vehicle owner has some amount of time (say, 14 days) to get the car to an inspection station. If the station finds there's nothing wrong with the lights, they certify to that effect, and the driver submits that certification and the ticket gets cancelled. If the station finds stuff wrong with the lights, they issue a report of problems found. The driver has it all fixed -- whether it's just a re-aim or a removal of the noncompliant bulbs or lamps and installation of appropriate equipment or whatever else -- then goes for another inspection, gets a clean cert, submits it and pays the ticket. The ticket cannot be cleared without a clean cert, and there are progressively harder penalties for subsequent offenses (to ward off funny business with wink/nudge "inspections" or swapping the lights to get the cert and then putting the bad ones back in, etc).
Sounds good, right? Takes a lot of structural support to make it happen. There need to be appropriate laws specifying what counts as acceptable lights and bulbs, hookup and aim; appropriate laws making it an infraction or offense to operate a vehicle on public highways with unacceptable lights, bulbs, hookup or aim; appropriate laws governing how inspection stations operate; funding for those inspection stations, and so on. The likelihood of laws like this appearing on the books is roughly zero. It's too bad the insurance industry doesn't flex its muscle on this; they could simply say "If you're in a crash and we find your car has been modified in a manner that affects its safety performance, your insurance is null and void; you will be liable for all costs and we will raise your premiums. Do it again and we'll cancel your policy and you won't be able to get another one."
