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.
Interested for 2 units.
Is the rotary going to be like the one of a sunwayman V10R/Jetbeam RTT01 or like a Nitecore EC22 ?
Both could probably be locked with a small sliding tab connected to a pin going in a hole into the ring to block its rotation.
I`m in for one.
great idea!
@hank&others, thanks for the research and norms, I guess then that this will not become a proper grandma light then, at least it will not be for the granniest of granniest 
One of the starting points of this project is that it must be an attractive light for flashoholics too (it must be fun to give this light away with a certain proudness) , and going back (with all respect) to D-cell Maglite format whith the performance not different from a S2+ does not sound attractive to me. I must confess that my personal preference for compactness in flashlights plays a certain role here 
One of my critical features for a muggle light is a battery level indicator. Then they won’t just leave it on charge all the time. Is there any plan for aux LEDs, or some other battery indicator in this light?
In for 1! Infinite mag adjustment and E17/21 option woulf be spot on!
Oh, great, so now gramma can go die in the dark and cold…
Great! In for 3!
In for 3.
Seriously, put on your spouse’s eyeglasses and a pair of welding gloves, and see how easy it is to use the device.
We’re all in denial about what abilities we’re going to lose as we age.
Interested for 2 units.