Suggestion on rear light?

Simple and cheap are fine for occasional road use, but if I'm doing a lot of daylight (or particularly dawn/dusk) riding on high use roads I want to be seen. For that I like an obnoxiously bright flashing tail light. The Lezyne Zecto Max I have on my road bike (250 lumen) fits that bill, as does the Magicshine SeeMe 180 (180 lm) I just put on my gravel bike. Both are bright enough that I have to turn them down if I'm riding with friends, but both give me an extra sense of security when I'm riding around all those SUVs driven by soccer Moms trying to kill me. These are $40-50 lights, and there are several others in that class from various manufacturers that have similar brightness, features and cost.

A step up from this is one of the Garmin Varia radar tail lights that give you a visual display of encroaching traffic on your bike computer. I haven't sprung for one of these yet since my Lezyne computer isn't compatible with them, but I think they're a great idea and I may just switch bike comps just to be able to use one. They're not cheap, though - $150 for a tail light hurts - but not as much as my wife hurt when she got knocked off her bike by a little old lady in an SUV a couple of months ago. She's OK now, but we've both kinda gotten the bike light religion since.

I got a Lenzyn Strip Drive pro for christmas. I'm guessing it was around 40 bucks. It is bright AF on the highest settings (daylight use only I'm guessing otherwise you'll be blinding and pissing off drivers behind you) and appears to provide high visibility even from a 90° angle. It also has a lot of settings, probably too many but no biggie since it turns on at the last setting that was used. I'd say it's probably two and a half inches tall and 1 in wide, unfortunately it doesn't fit on my seat post with my current saddlebag. Also it doesn't come with an adjustable mount for the seat stay or I would just use it there. On my bike (2021 Diverge) with its geometry, even upsidedown it points too far towards the sky in that location. I'll probably keep it for my kids bike and get myself a round cat-eye of similar cost.

Consider your mounting options and needs before purchasing. A lot of people have saddlebags and not a lot of exposed seat post under that.

Also consider batteries or rechargeable. At first glance rechargeable seems like a no-brainer but it can be inconvenient at times and require often charging. One or two AA batteries last a very long time in most bike lights and if you're going to be on the bike for many hours or even days then I think that's the best choice as you can just carry spares.

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Wife and I both have these. Last forever on a charge. Obnoxiously bright on some settings (this is a good thing). Have held up fine on 5 hour rugged gravel rides where we share part of the ride with cars. Worked for over 5 hours in a downpour... super weather-proof. Rubber strap wraps around the seatpost and has a super to easy to use latch. $23 at REI. Planet Bike Superflash 65 Bike Taillight | REI Co-op

Lezyne Zecto Drive 250 Lumen light. A strong day-time rear light. I have 2 of these.

The other rear light that I use and like that is somewhat like the Lezyne Strip is the Knog Blinder Road R70 Tail Light.