*BLF LT1 Lantern Project) (updated Nov,17,2020)

@alternety, very good points.

One point though: 18650 cells based non-replaceable battery packs SHOULD be used.

They are the most durable type of cells that exist in terms of longevity and overall durability due to their construction.

The one thing that I have to mention is that since this is a low cost commercial product with a non replaceable cell, there are 3 concerns that have to be address:

1. Build. A plastic build is cheaper in the long run. Parts should be easily 3d printable if really needed.
2. A long lasting battery pack. That means using something like a quad 18650 cell battery pack with charging limited to 4,00V for max longevity.
3. Waterproofing and durability. Using a potted USB port would be best.

I was talking to my ex-Peace Corp daughter today about the lantern and she mentioned that the Peace Corp (at least in Uganda) gives every volunteer a lantern and solar panel that they have to return when their tour is up. I bet the LT would be leaps and bounds better and way more robust. Robustness is important and hard to overrate when you’re posted to village of 100 people with no running water or electricity as some of her fellow volunteers were.

Locals in 3rd world countries would be amazed by the lantern. Flashlights we’re used to are Star Trek level to them. My daughter lit up her Zebra AA at a dinner her host family was having and their jaws dropped at the brightness.

I’m interested, glad there will finally be a good lantern on the market at a hopefully reasonably price

Yes BlueSwordM.

The battery pack should indeed be something like 18650s. They will be the most expensive component.

I gave a brief thought to the LiPo cells that are made as flat pouches. But I don’t think they live as long and are picky about charging.

If implemented, I would probably want to look at some of the other battery formats and sources. A good tie in to auto manufacturers and others using Li cells should produce some recyclable cells. And the cells Tesla is using, if there are low enough prices (I believe Panasonic has backed out of supplying batteries to Tesla). They are larger cells with, I believe, higher capacities. Manufacturers must be getting rid of batteries that fail to meet specs but are still new and usable. Connect with them as a charitable group. For most cell makers, it is probably more cost effective to give under-performing cells to a charity then selling them to a scrap dealer. They will get a tax write-off, and good press. The Tesla rejects would have a different form factor, but more power.

The V1 prototype is pretty much exactly that already for the description you have there, (except its metal and not plastic) it has a simple built in TP4056 charger, simple 4-mode efficient driver, single LED, simple on-off mechanical switch, & can run or charge on one 18650 or four 18650s with a simple 10 watt, 6-volt panel, (which i bought one for 15 bucks on Ebay) its simple basic design could easily be built & produced as an ABS type plastic low-cost model with the solar charger for between 25 to 30 dollars.

I have to say, I like the idea to build an affordable lantern for people who can’t afford or need the LT1. Here are some of my thoughts what we could/should change:

- using a plastic body sounds resonable

- only one 4000K Led, hopefully we can afford to keep the good cri

- simple 4 mode driver with only 3 or 5 7135 chips

- keep the 18650 battery format. Basic 2200/2600mah batteries cost less than 1$ when bought in bulk, but putting them in a battery pack might be good idea so that uninformed people can’t tamper with them. But that battery pack should still be easily replacable.

  • If we want to build a model for use in third would countries we should consider replacing the fragile usb port with a good old 12V DC barrel plug jack which would allow the lantern to be charged from car batteries which are often used in cheap solar installations.

Have to disagree about the car batteries being often used, or even common, in remote 3rd world country villages. Also the lantern is not going to be very portable if it’s tied to being charged from a lead battery rather than a solar charger.

It would be a toss-up for removable batteries. Major issue is letting literally stone age knowledge used to poke around in the device.

I don’t have a good feeling for what might be built. But I do think that an approach I mentioned before should be given some thought. It may just be a bad idea, but—

The device should be able to be used as a

1 - needs to be able to be focused (i.e., generate a useful beam) as a flashlight
2 - has to do area illumination for use in the house or some appropriate gathering, needs an attachable shade, perhaps user made shade if we provide an attachment point
3 - stores power from solar or other source
4 - can charge a phone
5 - water/dirt proof
6 - very minimal cost for electronics - not high end anything

I see modularity if possible. A waterproof box with the electronics an batteries. Maybe using this funny screw heads to keep people out. Though this may just foster an urge to beat the case open. A USB or some such for the solar and phone charging. Maybe two ports. + solar. Maybe 1 port and have to switch purpose. Or box where the user can use cables to plug in the light, or the solar, and the phone. Box would have everything active in the system. All else plugs in.

How about a set of cheap magnets to hold the lighting piece to the box. Rotate one way; flashlight. Other way lamp.

All off the top of my head. Just some directions to think about and break out of the thinking Q8 mode.

Could you add me to the list.

Hderek

A nicely designed camp lamp. Please scribble me in for one unit.
————-> Thank You

That’s an interesting idea.

I wonder if something similar to this ‘collapsible silicone bowl’ could be made?

I really like the idea of the warm-colored exterior, and Den said his best prototype has a white interior surface.

I’m not sure how/if a two-color object would work with silicone.

hello there, can you please add me to interest list as well,
takumi86

thank you!

Hmmm… Is your comparison of your “too many 4xAA things” made with good reliable brand AA Lithium Primaries compared to a good reliable brand AA NiMH Rechargeable??

That’s terrific! With a family member having been in the Peace Corps, you’ve got access to some useful inside info on their needs. The most important thing will be cost control… so agencies like Waka Waka would be great to leverage for their insight. They might be interested in partnering to some degree even beyond just facilitating the purchasing mechanism (their web portal).

That’s a neat idea. So essentially a collapsible shade can help control how much light will be projected with a simple one handed motion.

If only we could find those in bright white to test.
:+1:

On the side reflector department, how about some sort of tissue sock/sleeve you pull on the lantern? Part of it could be a fishnet like transparent section, and it would fold to nothing in a bag - or pulled down on the battery tube when not used…

My missus muggles would call the men in white coats to come & get me if I showed her that lampshade :smiley:

I like that idea :+1:

here is a clear bowl with accent colors perhaps we can spray paint it white on inside