After a long time lurking in here, I decided to buy for myself a D4V2.
Is it fair to say that high-quality lights don’t have adjustable beam width these days? I’m looking for something to keep in the truck and both flood and spot are necessary from time to time.
If not, what are key things to look for in beam adjustment, and what are good examples?
You can use a very strong diffusion foil or glass to get more flood
adjustable beam width is usually a ‘feature’ of non-high quality lights, as you said
if you do get a decent performing ‘zoom light’, it will not be small, light or cheap.
usually the zoom feature causes light to be wasted and oddly shaped beams either at flood or spot or both.
no, i don;t know a good one. there may not be one.
maybe as a previous answer said, you could get a very throwy light and use a diffuser [piece of milk jug]
or some ‘transparent tape’ [which is actually frosted] on the glass
diffusion is easy, focus is hard
it still will not be small, or convenient, and the flood pattern might not be what you want
wle
The wide spill of even a thrower does a better job than most zoomies on their wide setting.
The Jaxman Z1 is an excellent zoomie. I got a Cometa (clone), which is great, and the Z1 is even more highly regarded.
Else you can get a throwy light of your choice, and as mentioned already, keep a disc of diffusion film. Some have adhesive, others have nothing, and yet others are “staticky” and will stick lightly to any lens.
All my LuxPro lights use evil XP-G3s, which diffusion film makes really nice by covering up a multitude of sins.
My Xeno E03 is a relatively throwy AA light, which is nice, but I keep some DF on it literally just press-fit onto the glass and it just magically sticks to it, giving a wonderfully smooth blanket of light that’s absolutely perfect for close-in work.
Anyhoo, with stick-on DF, you can peel it off if you want throw, else keep it on if you want flood. Keep both the film and glass clean, and it can be stuck back on quite many times.
Thank guys, I’ll take them a look 
My favorite one is u-f10 which Ive bored for 18350, replaced the driver and the led. Fantastic light
Not expensive, but i gifted the one i had, i didn’t like it.
CW tint, not focused beam while zoomed, low output, plastic lens.
I would recommend the Z1
As much as I like zoomies ufortunately a zoomie won’t have the same output as a similarly spec’d reflector light. I built one from a host. Single 18650 and its really good quality, all aluminum. Only plastic is the retainer for the emitter and tail switch. I started with an sst40 and upgraded to an xhp50.2 and it’s fantastic. Look for my posts on here. If you aren’t super concerned with having the best and can do with 500 lumens, try one of the telescoping zoomies on Aliexpress.