Looks interesting, they may be able to formulate a phosphor mix for our after dark lights
It would be nice to be able to use only a single led with the right spectrum & not have to use monochromatic leds or filters to block the unwanted blue & green parts of the spectrum.
I hope they can consider such an request, i do suspect it is really only for bigger commercial orders though, but they seem interested in the less populated part of the market with items like high CRI leds & multi temp led strips for example, so it may be possible to get them interested in the almost totally empty & hopefully future non blue polluting LED lights market.
I have’t asked them formally yet, but i will someday when i work out how to best propose it to them. If someone don’t beat me to it that is
EDIT
Some of there products like the dual temp led strip would be perfect, for example a high CRI warm white & after dark spectrum LED “high CRI” or maybe full spectrum after 550nm is a better way to express it, or blue & green limited white LED perhaps.
Interesting! I filled out their inquiry form for their “custom simulator” software — which looks very promising.
Hope you will to — talk up BLF and the group design and quality control and group buy stuff people do here, and how it benefits builders/manufacturers who can go on with an improved product.
Maybe they’ll get involved.
It seems it’d be possible to combine a filter to block the critical wavelengths — somewhere in the 400-500nm range, roughly.
Aside — please do take notes and keep track especially of OLDER mentions of working on this problem. I know at least one LED company claims to have a recent patent on the idea of a low- or no-blue-light source (the US patent office is pathetic, about as good as the Australian patent office that, some years back, gave a patent on the wheel — and the way to challenge that kind of thing is to show “prior art” existed as public knowledge that makes a patent invalid.
Not sure about household bulbs, but for a flashlight, 44lm/W is not so bad if it is 90+ CRI. My most efficient cool white low CRI flashlight runs at betwern 90 and 100 lm/W. A stock sk68 clone is under 40 lm/W.
I have to wonder how difficult it would be to do something similar to what they are doing with the led filament bulbs that have popped up recently https://www.youtube.com/watch?v=H_XiunR-cAQ
Evgeniy, you asked where that spectrum comes from.
Go back up the thread to where I posted that spectrum, originally (not the copy you reposted)
Click on the one I posted, and it will show you the page where the image comes from.
It’s their spectrum from their web page, I did not create it.
(when you post an image link using the little “sunset” icon above the text entry box, it lets you first post the link to the image, and then optionally post the link to the source page, that ’s what I did there)
Nope, curious about them but not up for ordering stuff I don’t know much about.
If they had something like the Luxeon PC Rebel Amber with a bit of phosphor added to improve color rendering, that would be interesting.
But “no blue_ is what I’m mostly looking for that’s hard to find.
Interesting tidbit — even blind people who lack rods and cones still respond to the blue range by having their body clock reset, among other responses:
Let me see- I might have some 1900Ks. I bought a bunch of 6500K and (another) Violet pumped die and can’t remember if it was the 2700K or the 1900K… they only had them in stock for a few weeks.
Sorry, it’s 2700K VTC. I just found the order number in the inbox… under HIGH CRI Web Store, not Yuji.
After long discussion with Yuji manager I received next answers :
If I want buy modules with VTC led, now available only 3200K modules, only constant voltage, or any other - but you must request (and pay) 50 pcs [modules, not led’s] each type (2700,3200, 5000, 5600K, constant voltage or constant current).
Yuji really want sell it ?
90CRI is something within the range of most led manufacturers, Yuji is somewhat special in that all their leds are 95CRI+. Osram has a 96CRI led range, but it is generally very uncommon.
I tried to find what leds are inside the Ledon bulbs, but they have managed to hide that from the internet very well…
