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…
thanks for the links, angerdan, i enjoyed reading some of it . It seems like they produce their own leds/modules, but might source the led-dies elswhere (somewhere the USA is mentioned).
I have 95CRI 10 watt PAR20 Osram/Sylvania bulbs in my office and kitchen. They put out 550 lumens (more than 50W halogens). Three years ago they were $30 each. I did have one (out of 16) of the bulbs die. It was in the same socket where halogens tended to blow after a month or two (usually taking out the $35 Lutron dimmer in the process).
I can’t found any independent tests of Yuji LEDs, only 1 forum measurement.
And Yuji not sell CC (constant current) modules with all types of LEDs - only “if you ’ll buy 50 pcs modules of each color temp.”.