Junk science.

I made a new lamp for over my computer desk today. The broom dowel is designed to twist to adjust the aim.

I bought the COB LEDs but the transistors came from a broken CFL and the odd value resistors from my old collection.It underdrives the LED a bit but there's no need for me to be cruel to it.
Many people now insist on buying warm colour LEDs but I take plenty of photos and much prefer cool colour temperature ones.