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

Other Types of Lights LED Lanterns
4220

I’m speculating, but I don’t think Yuji makes LED packages themselves. My impression is their specialty is the phosphor, and they contract with other LED manufacturers to have products made with their phosphors. That would be favorable to being able to make “small” batches of specialty LED’s. However, “small” in the semi-conductor industry is probably tens or hundreds of thousands of pieces.

I did my own quick look for options. It’s probably redundant with searches djozz has already made, but just in case, hopefully this link pulls up the properly filtered results. Are any of these potentially suitable?

Digikey search for white 0605, 0705, 0803, 0805 packages

4221

I too like the shorter shade of V2 in order to keep it more compact. But either way is fine.

In relation to the 4-5 or 7 AMCs, would it be possible to have an option of ordering with the 7? I’d personally prefer the ability to go a bit brighter, while still having access to lower outputs for better runtime. What about an option of 8 AMCs? Makes it symmetrical for 2 chips per LED (or possibly 1 per LED during tint mixing). Just a thought. If not, where is a good place to get bare chips? I’m not very good at soldering, but would probably try it in order to get more output. Also, would a standard soldering gun work, or is something special needed?

Thanks for your work on this team. I’m pretty excited for it.

4222

At the moment the test-sample LT1 has all 7-chips (7 for each tint channel) enabled. I will be testing the run times & amps soon. As for adding chips, 7135s are readily available, and can “stack” them if your experienced with soldering and small electronic components. (but in this case pushing the current past 7 or 8 chips will increase heat, and in a lantern where continuous running is used it could be a problem with overheating the head.

4223

Thanks for the response DBSAR. And I just looked up Texas_Ace’s test of the LH351Ds and wow, they can throw out some good light. At 7 chips, it looks to be putting out around 1,200 lumens at the LEDs, so with globe losses, it should still be plenty bright. I wouldn’t need to go higher. I was just hoping for ~1,000 lumens as the brightest mode, and it looks like it can do that already…awesome. :slight_smile:

4224

Dont’ forget we are aiming for 4 chips per channel.

That means 8x7135 total.

4225

No! 4 total
The plan is to build all lanterns with all 7 equipped
How many are active by default has to be chosen

I don’t know if TK plan to have a sort of 4000K all AMCs turbo planned or not

4226

Please put me down for one more (total 2)

Thank you.

4227

What is the height difference between the V2 and the sample ? Doesn’t seem way more than about 1 cm.

4228

No, I wasn’t planning to have a 4000K turbo mode. It can’t sustain that much heat.

For anyone who missed the details earlier, the lantern has 14 of the 7135 chips, with 7 attached to each set of LEDs. So it can make about 2.45A of warm white and 2.45A of cool white. For the middle tints, it tries to maintain a steady power level while changing the amount of power which goes to each channel. But exactly in the middle, it could also have a 4.9A turbo mode.

In the current prototype, middle tints actually decrease in power because the mixing formula doesn’t account for the non-linear PWM response curve. But I plan to fix that in firmware so it’ll maintain pretty close to a steady power level regardless of tint.

I think the plan is to set the default power limit to 1.4A or 1.75A. This increases the runtime without making it visibly much dimmer, and it also makes the light safer thermally. But those who want more power could simply touch a soldering iron to a couple spots on the battery side of the driver, and it would enable more of the 7135 chips. Creating a solder bridge like this is really quick and easy to do.

4229

That sounds awesome and super easy TK. And thanks for the re-explanation of what’s going on with that. I apparently missed that earlier. :+1:

4230

Maybe this will be the precursor to a BLF light bulb with tint ramping

4231

Looks great, put me down for 1.

I’m only worried about the diffusing material. Looks too white instead of a frosted clear material (Like sticking DC fix to a clear lens). White semi translucid diffusers can degrade over time and turn the tint yellowish/greenish.

4232

I just measured it, and the test unit is 6 Millimeters taller. ( 1/4” inch)

4233

Wow, I didn’t expect that much. Thank you for measurements.

4234

Apologies for being slow, but now I’m really confused - is the plan 14x 7135 chips on the board in total (i.e. 7 per channel) or 7x7135 chips on the board? Also, I’m glad to hear that all 7 chips are going to be populated - I think my soldering skills are up to forming a solder bridge, but probably not up to sticking an extra chip onto a PCB…

Edit: Where are my manners?! Thank you to team LT1 - I am now ridiculously excited about this project. There’s already so much incredible work that you’ve put in, and I’m very grateful for it!

4235

Oops, typo, i meant 6 millimeters. :smiley:

4236

:smiley:

Right after your response I looked again at the pictures trying to figure what I didn’t get. My brain froze with confusion…how could it be 6 cm ?!?

:smiley:

4237

Ah yes, I remember we discussed about it in PMs.

All of the 14 7135s will be soldered in.

However, only 4 per channel will be activated at the same time.

4238

I would love one. Thanks!

4239

That’s awesome that all the 7135s will be populated and that we just have to make solder bridges to bring the others “online”. Very smart and thoughtful of you all. :+1: