The usual types of fluorescent light sources used for growing plants are in the range of 6000k.
Build your own fluorescent light.
I want to build several letters out of fluorescent light bulbs for example one letter is o but it will look more like.
The replacement ballasts for a 4 lamp is about 99 the good lock in sockets are about 5 so just for the sockets and ballast you are looking at 140 the regular 4 foot fixtures dont have reflectors i highly recommend them for the t5 you dont want any up light for growing you want only down light with out the reflector you ll be losing some serious lumins plus a ac power cord plus wire nuts.
I am not asking how to build the bulb.
4 x 15w black light uva fluorescent lamps with a peak of radiation at 350nm.
I want to use bulbs that are 2 4 feet long or what ever is easiest.
Of course there is still the option to simply build your own reflectors.
Well this is all about it.
Here s how to build my faux flo ring light.
Just attach the bulb ballasts plug it in.
Those lamps are suitable for photochemical procedures and can usually be used in insect killing.
I hope this guide will give you the motivation to build your own pcb exposure box or at least to make you play with those little gems.
From scratch without buying light fixtures and taking them apart.
So why not save a few bucks and build your own ring light.