I am thinking of producing some linear fixtures using their smd LEDs.
yuji has/had strip modules in the VTC series.. also ribbons.. some w/ dual spectrum (high k low K ) on separate channels..
Problem was all constant voltage and their inventory and products change w/ the wind....
You can get them in constant current arrangements but pricy.. real pricy..
They do make the CV ones w/ little waste w/ the resistors so not much of an issue.
as to L/w Sorra has the same issue..
Keep in mind some of this is "measurement error". Lumens underweight a good part of the "full spectrum" LED's..
PAR or some other measurement is more fitting.
Point is a high powered "horticultural" LED w/ little to no "green-ish" would have a poor L/W ratio...due to measurement "error" yet be quite strong.
some COBs are now exceeding 150L/w
as to "color changing" well to me that is THE point of LED's...Fading (and ease of) next.
but I wouldn't consider myself a target market either.