What are the main contributing factors in a Cyno outbreak? Fix?

[spreerider]

lights not only shift colour but they lose more then 50% of their light output in the first year, at least Flourescent lamps, MH keep brightness longer but lose their peak wavelengths and become a more ballanced light that turns more yellow and grows algea better.

[mseepman]

But do you think new lights in a spectrum we don't usually use (really high at 50k) would cause this?