You can’t make a sow’s purse out of a silk ear, so trash the Atomic Crap and get a decent light.
Those generic zoomies are not terribly moddable, the LED held in by a crappy press-fit disc which is essentially ruined when you even think of prying it out. Drivers are crap, and I think the Atomic Crap has a “smart switch” in the tail, ie, it’s a momentary pushbutton on the tail that’s like an e-switch on the side on most other lights. That said, the one that mum got :person_facepalming: isn’t that horrible, but they’re still crap.
For a headlamp, a Boruit D25 is cheap and good. There’s a Sofirn version, I think, which uses SST-whatevers, but I can’t recall details right off. I’ve got both, and they’re both great.
Zoomie? Jaxman Z1. You won’t regret it. I’ve got the cheaper clone version of it, the Cometa, which is awesome but discontinued, and the Jax is even better.
Otherwise, if you want compact throw, a GTmini is nice, else any of the 3796 flavors of C8-based lights.
Modding? One of the easiest lights to mod is the Convoy S2+. They’re great off-the-rack, but they come apart easily, and modding them is as easy as falling off a toilet. Any 17mm driver will do, and any 16mm board for the LED.
Get the 4C tint, and replace the reflector with a 20mm TIR lens, and you’ll have nice warm sunlight coming out the business end. TIRs come in anything from 5° to 90° and even 120°, so you’re covered from spot to flood. And swapping TIRs takes all of 2min with pointy tweezers or a set of ring-pullers. You can get TIRs individually or as assortments if you look around.
Just avoid the lights with “3/5 modegroups”, as that has the evil blink-on-low which’ll drive anyone to drink. Get, well, anything else, biscotti or whatever comes-with.
Plus, you can get shorty tubes to take 18350 cells to make the light even shorter. And they come in designer colors like orange, violet, and teal, as well as red, blue, green, silver, black, gray, another gray, and yet another gray.
Go crazy…