It looks like there is another option for extremely warm white aside from E21A’s.
A member of the flashlight reddit shared recently that Luxeon 2835N is available from Mouser in 1800K, 90 CRI. These are 2835 size, so they should be a perfect fit for Sunlike’s board:
A 2200K, 90 CRI version is also available:
The datasheet is here:
These are mid-power LED’s - binned at 65mA, max rated current 300mA for the N series (1st link) and 480mA for the HE series (2nd link). This should be fine for the LT1. Maximum current per emitter with 7 x 7135’s divided by 18 emitters would be 136 mA.
The spectral graph is on the bottom half of page 10 of the datasheet. I’m sure it’s not Sunlike level CRI, but it looks as it should - still a little light available past 450nm on the blue end of the spectrum, and lots of light at 650 nm and beyond on the red end.
These look quite promising. I’ve been really busy over the past month and have been unable to follow blf. I sent an email to LampMan yesterday and I’m waiting on a reply.
So, if I am reading correctly… I would go to his website, configure and order but not pay until instructions are emailed? Looks like maybe delivery sometime this winter?
Just to be clear, he lives in Belarus and the updates say he was arrested for speaking out about a member of Lukashenka’s regime online, so he’s currently a political prisoner like many people in that country. The latest update is his mailing address at the prison where he’s being held, so it doesn’t seem like he expects to be released any time soon.
Hey y’all, I’ve been busy and haven’t been following this closely but it doesn’t look good for this project.
I looks like our friend LampMan won’t be following through with the boards. His website http://sunlikelamp.com/ is now down. I don’t understand what he is saying in audio recordings on telegram but I don’t think he is doing very well.
I wish him the best as it looks like he is in some pretty severe trouble. I don’t think there’s anything we can do for him in Belarus.
I am sorry to all those who paid, it looks like we won’t be getting our boards and if you paid at the start like me, it is probably too late for a payment dispute.
I’ll see what I can do to make it up to you. Does anyone know where we can get sunlike LEDs or similar, very high cri 3v ones, for a low price? I’m really busy now but I am willing to draw up a pcb in the future when I have more time, and jlcpcb offers cheap aluminum boards so we could get them manufactured easily.
Lampman’s problems are way worse (looks like he is jailed by the Belarus government for having an opinion ) than the few dollars that I lost, I’m ok with loosing the money, and I can only hope for Lampman’s situation to change for the better.
I am not concerned about losing the money I sent for a board. It is very concerning that a person can end up in jail for having am opinion that some government does not agree with. All my best wishes to Lampman.
I am very happy to see you have been released and very saddened and angry to hear about your son. I am not concerned about the monies I sent you for board and led’s. Take care.