Hi Frecupido, don't give up just yet!
I'm guessing that the 3000L lumens is based on previous experience of using a cheep Amazon Chinese made light, that may have been advertised as very high lumen, but actually wasn't.
Honestly I'm certain that even 1000 lumens is going to help see very well on your walks.
As you need something very bright, you'll want a light that is rechargeable, and not too small for a larger battery capacity. You probably won't want to mess about taking the battery out to recharge too, as you'll risk dropping the tailcap. So this narrows the selection down a bit. You'll also want to avoid some of the lights that where the heads get too hot (like Olight), as that is too risky for you.
So I'd recommend any of the following:
Maglite ML150LR(X)
[Maglite also have other large rechargeable models]
Streamlight Stinger 2020
Fenix PD36R
Fenix PD40R V2
LEDLenser MT10
Pelican 7600
Pelican 8060
The above range from 1000 - 3000 lumens, all rechargeable with battery in-place, and all will most certainly be more than bright enough for you.
If I had to pick just one, hmmm tough choice. All great for different reasons, such as size. materials, backup batteries etc, depends on your own preferences.
Good luck.
BTW get a high vis jacket, or waist band too, and don't overlook the need for a good bright headlamp, as actually it may be a better option, depending on where you are walking at night.