It doesn't help that there is such an enormous amount of garbage product on the market. Much of it is marketed as "bling" with no pretense at being anything else (i.e., very few grandma-and-grandpa types trying to see better will buy it).
But there's at least as much dreck being straightfacedly marketed as a seeing 'upgrade'. I hesitate to say "the latest" I've seen, because it surely will go out of date by another "latest" by tomorrow, but here it is: a cheap and nasty 200mm x 142mm headlamp-shaped thing, that looks pretty much like a headlamp if you glance at it quickly or don't know what you're looking at. Glass lens and metal reflector. Sold as an "upgrade" by Delta, with your choice of a variety of blue H4 bulbs, or you can get different-colored HID bulbs or LED bulbs in it, and it comes with or without a city light/turn signal/daytime running light (depending if you specify a white, amber, or blue bulb or LED). Leaving aside the complete fraudulence of just about every main and "city/turn/DRL" bulb option offered, look closer and you'll see the only marking on this thing's lens is a small "HS1" in the corner. The HS1 is a 35/35w version of H4, authorized only on low-speed small motorcycles with tiny charging systems. It has different base tab placement so it's not physically interchangeable with an H4; the dingbat who runs Delta has had its offshore maker install an H4 bulb seat instead of the HS1 bulb seat. There is no other marking on this lamp. It doesn't (and couldn't even come close to) meet any UN/European, US, SAE, or any individual-country regulations. It is literally a headlamp-shaped toy. Beam pattern? No, that term only applies to a distribution of light that's engineered and intentional. About the only vehicle this would be safe or effective on would be those coin-operated kiddy-car rides at the mall, or one of those theme restaurants where there's a sawed-off car front end on the wall with the lights on. And yes, these are marketed to grandma and grandpa who are trying to see better!
("They're H4!")
Then there's a vendor in NY or NJ who has positioned himself as catering to owners of classic cars, many of which take a 7" round headlamp. This dingbat has "reproduced" (i.e., knocked off) the Cibie lamp. Instead of the Cibie logo and name is a cartoonish pictogram of a car. The "E-code" marks on the lens are nonsensical. There's an (E9) which, if it were real, would mean the lamp was homologated by Spain's type approval authority. There's a double-headed arrow ↔ which, if it were applied legitimately, would mean a headlamp capable of being adjusted to produce either a left- or a right-traffic low beam pattern (keep in mind this is a cheap copy of a headlamp designed to produce a right-traffic low beam and a high beam and nothing else). There are other marks that seem to have been chosen at random. This is the second revision of this knockoff junk; the first was a Z-beam copy. Made in India at apallingly low levels of quality, and, here too, not producing anything that could be called a "beam pattern". People buy and drive with these things thinking they've "upgraded" their headlamps, when in fact leaving the original dim sealed beams in place would have been far safer.
("They're H4!")