No, the exact goal need not determined, this project is not a discussion piece towards what sort of light is needed for a certain group of people, this project is making the light described in the OP 
You can discuss however how to call it, a grandma light, a muggle light, a budget flashoholics light, or something else.
Interesting project. Please add me for 3. Many thanks.
Interested!
Love this 100 horses pulling in 100 directions discussions on BLF.
Until someone like TK comes along and tries to pour all that loose sand through a siff.
(and gets blamed that only 99 horses were satisfied).
I would like you to consider: we are not grandma.
- We’re still flashaholics who try to decide what’s best for grandma.
- Most of us are creative (wo)men with only one thumb on every hand.
- If you wear glasses: put them off.
- If you don’t wear glasses: put your wife’s glasses on.
- Put on some leather gloves.
My personal opinion is that a ring is a 2-handed thing. A slide is not.
A ring cannot be locked out. A slide can, just push it beyond a certain limit.
A magnet comes in handy. But make it removable when you find grannie stuck to the fridge.
Ano is good. Visibility is better. Give it a distinct business end. And a striking color.
For the last aspect (and falling) you can include a rubber cover. The usual pink or blue.
And safety orange for those who are still contemplating their gender.
To be ignored: I was thinking about a 2 (big) button UI.
Button 1 = on and up
Button 2 = down and off
Just my 2¼c.
EDIT: and put me on the list for one. By the time it is finished I’ll be in my seventies.
Djozz, I’ll take one!
Sounds like a compact and simple light.
Just a suggestion, make the Ring of stainless steel and make it a nice contrasting color like bare SS or a nice blue.
That’ll make it easier to understand that it’s the control ring.
Many requests for a contrasting ring colour, it sounds useful, very doable without adding cost, and gives a nice accent to the design. I will try to get that added 
Your and other’s many suggestions are noted.
I can promise that the ring, like my 3 other lights with magnetic ring are easily operated with one hand.
When is your birthday Henk?, so I can slow down the process to make sure you are 70 when it is done. 
Are you sure?
I was born shortly before the Korean War started. Yet I doubt one event is related to the other. :innocent:
Well, I prefer infinitely variable and forward clickie, but Sofirn has been always very helpful with BLF and I like magnetic rings; so, I will take at least one of these; and probably a pair more for gifts….
One more time, thanks Djozz for your initiative
Okay, i’m in for one too.
If it works as well as others have experienced a thumb operated twisty ring, i’m all for it.
Hoping for no PWM and stepless dimming, either with or without indents.
(For the modders it would be awesome if the driver will be sold separately also, and capable of high currents with a resistor mod.)
Interested in 1.
Thanks, I enjoy doing this.
I love how BLF evolved from only modding existing lights to also creating complete new flashlights, with the help of a few companies who trust our expertise enough to overcome the hassle of the language and culture barrier.
I hope that this will be one more nice and innovative flashlight on the BLF list.
In for one, maybe 2.
I would prefer no moonlight modes for this, too easy to think the batteries are flat/leave it turned on/etc.
Off/30/500 LM would be amazing. Either with a separate on/off tail switch or without.
Parasitic drain would worry me, it’s usually a few years between uses for lights I’ve gifted my family members.
I’m interested. Depending on how the final product shakes out I’ll probably pick up at least a couple for gifts.
The parasitic drain of the Sofirn DF10 with its magnetic ring in the off-position I personally measured at 33 micro-amp, which would drain a 3000mAh battery in over 4 years. So it seems that Sofirn is already able to keep it low. But it is something that I will certainly keep an eye on once prototypes appear.
Maybe a magnetic switch (reed switch) that’s small enough to fit the driver that could act as an electronic switch?
It could lower the parasitic drain to below 5uA like many other electronic switch lights.
I would definitely be interested in buying some of those lights! This is exactly what i’m looking for. At this phase of the project add me for two.
They tend to have a large hysteresis though…
Guidelines for designing handheld tools for the elderly.
Note for exmple the mention of rocker switches.
Oh, and the diameter section for handheld tools:
Could be one reason the old 2D flashlights remain popular with older people — the battery tube is big enough to hold easily and to find.
In for one.