Hi Hermie,

I went the actinic white route years ago after taking my first horticuture course in college. (oldest in my class) We studied the need for certian wavelenths of light, at various times of growth. Besides the need for blue light to stimulate hormones related to the roots it was my first introduction to the need of abt 660nm for photosyntheis but also the need of 730nm far red. Learned a bunch of other usefull stuff, like willow water for clonning.

Kinda led me down the slippery slope of LEDs.
The idea to use a actinic florescent bulb came from a glasshouse operator in my area, that I spoke to about his asexual propagation via cuttings (see what they learned me). It's what he was using and I adopted.

SIDE NOTE: I recently found out you can't mix T5 HO bulbs with NO bulbs in an ice cap ballast set up. You can run all NO or all HO but not a mix of both, if you expect the NOs to last more then 12hours. lol Live/learn.

pis of actinic in action. Royal blue is a good thing, I hope.