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 $35 Lutron dimmer in the process).
I can’t found any independent tests of Yuji LEDs, only 1 forum measurement.
And Yuji not sell CC (constant current) modules with all types of LEDs - only “if you ’ll buy 50 pcs modules of each color temp.”.
I’m going to defend Yuji here a little bit- they sell phosphors. The modules they offer aren’t the best- their modules are for demonstrations- but they ARE very nicely built, thick aluminum, robust wire-insert connectors. I suppose you could gang 2x or 3x into a strip light if you wanted to and minimize additional manufacturing time- I’m personally working on designing some bars.
They were responsive about adding a ‘sampler pack’ of various dies and color temps. I wish they’d include a 1900K unit but I’m good with the 2700k.
Just an opinion. I like their stuff… and I’m pretty picky.
what about bridgelux Vero decor series, they have a 2700 and 3000 K CCT with 97 CRI also 5600 K CCT with 90 CRI, i bought them from Digikey for lighting my Aquarium why buy unknown brand while you can buy a well know brand and much much much cheaper
i got the Vero 18 Decor with 5600 K CCT with 90 CRI it is about 70 Watts for 16$ only