Okay,
We've studied the problem. It's the lights. It's become obvious to us all that now, in the my poor Ducks sorry bleached condition, that the affected areas perfectly conform to the hotspots under the lights. Tops away from the worst of it are perfectly fine so the conclusion is inescapable. This conclusion has been confirmed by experienced LED guys, elsewhere. The conclusive factor is that they've not responded to plain water flushing, and they should well have by now were that the problem. Instead, even on veg setting, the problem has only advanced on all surfaces not shielded by large fans; tops under large fans are fine.
I'm disgusted! I've used this popular brand with good results in the past so thought nothing of their 'upgrading' to 5W chips. These units are brand new and absolutely worthless! I'll not mention the brand, but will be watching for others who'll suffer this bullsh-t, eventually.
As it is, my Ducks are suffering and I'ma go confiscate my GrowSuns from my wingman. They're not ideal because I loose four precious inches of height, but it beats these turkeys roasting my Ducks! To be honest, don't know if I'll manage to stretch them much further before the chop -- and again I'm stressing over seed viability!
No, I'm not putting up pics, it's too tragic a sight! I'm seriously steamed!