Many of Luminus’s preliminary products have been circulating in the market for a while before being announced, including but not limited to SFT-25R and SFT-90X. Sometimes KD gets it earlier, sometimes later.
Afaik it’s “custom”, not sure which OEM it’s, it’s their secret.
I don’t think so, LED manufacturing and customization isn’t rocket science, LEDs that look similar may have little to do with each other. New high-efficiency LEDs will depend mainly on whether SanAn manufactures and sells these chips, Luminus as their brand, may released their version relatively late.
According to the unpublished datasheet, the new SFT-70X-WGH will have these CCT and CRI options, but no 4500K. From what I’ve observed, some Chinese and Russian sellers already have the 3000K ones, but the much-anticipated 4000K still hasn’t appeared.