Hi all,
Bit late to the party/controversy about spectrum! I found Clive's post #34 interesting https://www.ukaps.org/forum/threads/is-this-normal-for-staurogyne-repens.35680/page-2#post-383568 - he includes photo's of plants grown at 10,000 8,000 6,000 & 4,000 kelvin...All lush & healthy ☺