By threshold, David means that the intensity of the light must reach a certain level to induce the production of
anthocyanins (or some other pigment that Helis possess). The threshold is basically the level that must be reached to cause some sort of reaction.
I do imagine that Nepenthes can reach maturity through artificial lighting, though it may take a very long time.
Ah, alright. In that case, I had always understood that Helis needed quite a bit of light to color them up, I guess that means I can lower my Heli a bit further away from my lights.
Nice setup; though I would remind you that those highland and ultra highland species -- occurring as they do -- at altitude, will ultimately require far more light to develop and thrive. I have yet to see either Nepenthes edwardsiana or N. villosa reach maturity under artificial lighting . . .
Thank you! This whole thing is an experiment, that's half the fun of this hobby for me. My plan is to build a greenhouse as soon as I'm able. I'll just keep tinkering with my setup until that day. As of now everything in the wine cooler is growing well.