Those ones from Andy's really do seem to have been grown in high light don't they. Mine (from Germany) must have been grown in a lot lower light as it's not yellow at all.
It will be interesting to see if they turn greener again if you guys grow them in lower light than they used to be in. Or whether it's only new growth which comes out green.
Mine will be in lower light as I have a shade cloth on my GH and it's even shaded sometimes during the day by trees. It will be brighter this winter though.