@Rowan welcome to the forum.
Sharing this link (US based company) that seem to have a good selection of known-brand LEDs at somewhat reasonable price. I have not ordered from them, so take it as an internet find.
When playing with the LED, I started with folding a high CRI LED strip, and then moved into designing my own PCB with a sourced LED.
(the rulers on the mat are inches).
@cpixip suggestions are spot on, specially in regards to his work with the color of the HQ sensor.
I have considered designing a smaller PCB than what is shown in the picture at the bottom, and make these available. But the form factor of each design varies so much that it may not be practical, and the cost would be much more than what the link above provides.