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

Other Types of Lights LED Lanterns
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Ok, -a thanks go out to member SKV89 for sending me four of Osram’s High-CRI emitter to test in the V1 BLF lantern prototype. (I use the V1 as the test-mule for measuring outputs, tints, etc of LEDs for lanterns)

The four LEDs sent to me for testing are the Oslon Square LCW CQAR.CC MQ-6U-L2 , MQ flux bin, 6U tint bin, and L2 forward voltage. MQ = 194 lm – 210 lm 6U = 2700K L2 = 2.90 – 3.00 V ) emitters.
They are a smaller substrate foot print than the 3535 XP sizes, ( more on the 3030 size, but they will flow onto a 3535 Cree XP board with no problems as i measured the center thermal-pad to be the same width, just the + & - pads are narrower on the Olsons.

- First positive i noticed is that the Osrams as nearly no angular tint shift, almost similar to the Nichia 119 or 219 series, but more efficient per amp input. (As almost all Cree emitters have very bad angular-tint shift, except for the MT-G2) the Samsung 351 series has almost as bad tint-shift, while Nichia and these Osrams has almost none, which is a great thing for a lantern to have full natural light tint consistency from all viewing angles.

For those wondering what angular tint-shift is, if your familiar with the horrible green tint caused by the original shallow-angled reflector Olight S20 then you know, or see this topic to understand: The CREE "Angular-Tint-Shift" flaw syndrome..It's causing brain damage.

The Lux output at 1 foot is comparable, (Samsung 351B > 42 on Medium , 167 on High) ( Osram > 43 on Medium, 165 on High)

as for tint to the eye, the Osram is much more “natural” . The Olson Square 2700K appears to my eyes as the closest light tint to what of a 25 ~ 40 watt Incandescent light bulb, probably due to the very slightly warmer tint, but much better tint emitted from all angles of the lantern, (less angular tint shift) than the Samsung 351B 3000K.
If i had a choice to have the production BLF lantern to have for the warn tint channel, it would be to use these Olson LEDS for the warm tints. I don’t know if they have a larger 5000K version, but the best 5000K tint LEDs to use for the cooler-channel is still the Samsung 351D 5000K, but definitely these Olson Square 2700K, as i really like the linear tint form the light angles.

As seen below, the greens & reds and ever other colors seem to just stand out much more natural from these Olson 2700K than it does from the Samsung 351B 3000K. (photos take with lantern on medium mode)

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Yeah Den, keep teasing us while we patiently wait for the lantern :laughing:

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Those osrams are special for sure!

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I’m surprised that Oslon Square 96CRI compares so well to the LH351B in efficiency because the color rendering is so much superior to the LH351B. The R9 is a whopping 96. This has the best color rendering of any emitter I’ve seen besides the Optisolis. I really hope we will see this emitter in the production lantern.

Here is the test result someone posted for the Oslon Square 96CRI 2700k

Here is the test result for the LH351B 90CRI 3000k by Maukka. The R9 is only 70 and it has an above the BBL DUV of 0.0023, which puts it on the green side.

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Depending on price, i would like 5 of them….if that’s ok

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What is the Duv of the Osram? Generally it’s typical for warm LEDs to have a lower Duv compared to neutral ones.

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I would love to know too but comparing with my other WW emitters, it’s definitely not above the BBL. Its one of the best WW tints I have seen and I have seen about a dozen or more

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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 “natural” 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, Barry’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 can’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.

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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

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Thanks :slight_smile: OP list updated!

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DBSAR,

Here’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 I’d be one happy camper. I :smiley: :innocent:

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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.

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

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

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Please add to interested list x1

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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.

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If the Squares will make it into the lantern you should remind Sofirn of the 3030 footprint, to have a correct ledboard made.

3305

good point.

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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

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no and no, and I don’t blame you.