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.
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.
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.
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 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