Please add to interested list x1
With CRI over 95 and R9 over 95 it should be an excellent lantern. Much better than the Samsung.
When I light up my Nichias everyone notices the excellent colour. But with a lantern it will be a lot better because it will be used as general lighting in a room or outdoors, and for extended periods of time.
If the Squares will make it into the lantern you should remind Sofirn of the 3030 footprint, to have a correct ledboard made.
good point.
Just out of curiosity… Is the center bolt going to be copper sleeved to transfer heat to the batteries when used in the winter?
Red light?
Sorry don’t feel like backreading 111 pages
no and no, and I don’t blame you.
ALL batteries will perform poorly in cold weather, regardless of whether they are lithium, Alkaline, Zinc or lead-acid. In fact, a lithium battery will still outperform a comparably-sized Alkaline or lead-acid when the temperature drops. As a result the battery will warm up internally and gain enough “juice” to run when loaded. I have had a 18650 light stored in the center console of my truck now for the last 4 years, and even during –30 Celsius winters it worked fine. Its not a big enough concern to have a heater-tube for the cells, as 80% + will use the lantern in summer, indoors, or at least stored indoors in warm temps.
Agree that also reduce the temperature of LED/head section.
One thing though:
NEVER CHARGE LITHIUM ION CELLS (18650s/21700s/14500s/18350s) below 0C.
Otherwise, they will degrade permanently.
I forgot to mention that charging cold LiIon cells is bad for them. (meaning any heat tube wont work if the lantern has been off & stored in a cold area with low batteries.
Yeah forgot too honestly about what Lexel implemented in the form of a temperature charging cutoff at 0C.
Storing (or using) LiIon cells in cold temps is fine, its just they don’t like to be charged when really cold. (I would warm them up to room temperature first before charging them.
I’m interested in one as well
Thanks!
Looks very sweet! Please add me to the interest list.
If this ever happens… I am interested!
Please add to interested list x1
I added to the charging circuit as described in the datasheet a NTC and 2 resistors to set low and high temperature
as the prototypes get build by Sofirn this needs to be tested as well
I’m interested in two
Thanks
I’m interested in one piece.
Thank you for your great job.
Please add me to the list for one.