This is reflected on the fluorescent tube types with a three digit code three band fluorescents.
Build your own fluorescent light.
4 x 15w black light uva fluorescent lamps with a peak of radiation at 350nm.
Here s how to build my faux flo ring light.
The best spectrum is about 6500k with a natural balance of red and blue.
Well this is all about it.
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.
Rather than making a strobe version though we re going to use a circline fluorescent bulb which means this constant source can not only be used for still photography but for video recording too.
Those lamps are suitable for photochemical procedures and can usually be used in insect killing.
I am not asking how to build the bulb.
Just attach the bulb ballasts plug it in.
I want to build several letters out of fluorescent light bulbs for example one letter is o but it will look more like.
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.
So why not save a few bucks and build your own ring light.
From scratch without buying light fixtures and taking them apart.