I know a few was waiting for this topic with the video about the many micro lanterns i built & modded, the video shows most of the details.
- These all range from 5 lumens up to 50 lumens, and all brighter than a candle, even the tinyest, wallet size, which has a run time of 20+ hours on a CR2032 coin.
- Also both the micro “Hurricane lantern” and micro camping lantern, (smaller than a C-battery) has run times of 20+ hours on, and have a fire-fly glow mode that will likely run for 4+ years on a CR2032.
Below is the innards of the simple “wallet lantern” with 20+ hours run time and brighter than a candle.
I used a single/dual on/off micro DIP switch. i used a 22 ohm , 1/8 watt resistor for the “on” mode, and used a 400K ( 400,000 ohm) 1/8 watt for the night glow mode that is wired direct to the battery holder.
It runs on 2xCR2032 and comes with a Nichia LED. It has possibly the most impressive diffuser I’ve seen on a lantern this size. Conical mirror combined with a reeded linear optic. Of course I replaced the LED with a 3200k yuji. The keychain junk was replaced with a lanyard. I make my lanyards a bit longer than yours - just long enough to slip over a door knob. The battery situation was trickier. What I ended up doing was replacing a CR2032 with a thin rare earth magnet. So now it is dimmer and I can stick it just about anywhere between the lanyard and the magnet.
You made me decide to buy 2 lights.
The NEBO and the smallest CR2032 ones. Though I fail to find a cheap source of the latter, FT seems the best, $3.51 for a 10-pack with the BLF coupon. I have a feeling they can be had for less…
I wish i knew who makes those remote-phosphor warm-white 5mm LEDs, as they are the most efficient, widest light-angle tiny low-power LEDs i ever seen. these seems to glow the brightest of any LED i ever tested for a white LED on a 300K+ or higher resistor. (other than the tiny straw-hat blue LEDs) So far its only in the Walmart $1 garden solar lights i have found them.