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

I am very impressed with the Osram emitter. From my testing of the ones you sent me, the output for the same amp-load is roughly the same as the 351B, but i do like the more natural rosier tint better of the Osram, because it just looks more ā€œnaturalā€ and a better replication of an incandescent light bulb than most others i have tested. Barry of the factory also told me that those Osrams are easier to get in large numbers than other High CRI warm white LEDs, so it may work out. ( to have the Osrams as the warm-channel at 2700K and Samsung 351D 5000K (or Cree XP-L 5000K) for the cool channel as a reserve LED if the Samsungs are hard to get. (with nearly 1400 BLF lanterns awaiting to be bought, Barryā€™s factory has to order 5000+ of each for the warm channel and 5000+ for the cool channel.

Here is a close up comparison to what the Osram Olson Hi-CRI 2700K to the Samsung 3000K 351B ( the 351B as a smaller die than the 351D, so it compares better to the Olson die size, or somewhat to the very in-efficient Nichia 119 smaller-die series which canā€™t match either the Osram or Samsung variants in the 2700 to 3200K color range for lux output versus amps-load.

Below the samsung 351B on left, and Osram Olson Square on the right: ( lantern was on medium-mode, both pulling 0.74 amps from the four 3600mah Panasonic cells, (roughly 0.18.7 amps per cell, so tested to give a run time of roughly 27+ hours of light output equivalent to a 25-watt incandescent light bulb on one charge.

Update to the interest list, the next 10 entries:

1132 Plotthound
1133 niktak11
1134 ZozzV6
1135 ZozzV6
1136 jaharkes
1137 kntx
1138 kntx
1139 kntx
1140 kntx
1141 kntx

interest list sorted by entry number

interest list sorted by user names

Thanks :slight_smile: OP list updated!

DBSAR,

Hereā€™s the source of the measurements.

The reason these are so good are the tint bins. These are analogous to a 219B SW45k. Tint binned on and below the BBL.

If Barry can get these awesome bins Iā€™d be one happy camper. I :smiley: :innocent:

Thanks for the link. Either way, the tint and color rendition of these Olson 2700K LEDs are the best pleasing natural warm white i have seen & tested so far from any LED to be as be close to a Incandescent bulb light, or light from a Coleman gas lantern to the eyes.

Cannot wait for this to come to out, especially if the Osrams make it in. :slight_smile:

I think we are looking for a recommendation for a 5000K Osram LED as well, chime in if you have a recommendation.

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 curiosityā€¦ Is the center bolt going to be copper sleeved to transfer heat to the batteries when used in the winter?

Red light?

Sorry donā€™t feel like backreading 111 pages

no and no, and I donā€™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 ā€œjuiceā€ 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 ā€“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 donā€™t like to be charged when really cold. (I would warm them up to room temperature first before charging them.

Iā€™m interested in one as well
Thanks!