Hi Folks. 2 things of note.
1.
When using this particular style fixture,
please keep in mind they do come in 2 types now.
In the most common 22" size.
And they are identical looking.
One is made with a HO (high out-put) ballast that dives a 24 watt bulb.
And one now comes made with a low out-put ballast that is only engineered to run a 14w bulb.
The 14w fixture is IDENTICAL looking and made with a ballast that only runs a 14 watt Bulb (Nominal Out-put).
A 22" unit made for a 14w bulb will not not properly drive a 24w HO bulb... and vice versa.
For most Cham applications....
you probably will want the one that drives the HO 24 watt bulb*.
(*Except in the case of Carpet chams in a shallow cage and / or baby chams that are in "shallow" cages where they are close to the bulb(s).
The
"ShadeDweller" Nominal Out-put version of the 22" fixture that has the 14w bulb may be a better choice.
The 14w version could be a good choice for Carpet chams and / or baby chams that are in "shallow" cages where they are close to the bulb(s).
An example of one that drives a 14 watt bulb is this:
https://www.arcadiareptile.com/shadedweller/max/ . )
Again,
It is good to be aware now there are 2 types of this fixture on the market that LOOK ALIKE at a glance.
When in doubt,
just check the "fine print" stamped on the fixture!
It will tell you if it is designed to drive a 14w or 24w T5 Bulb.
2.
Another thing to keep in mind is that these fixtures have a good reflector with a tight "curve" to it
that CONCENTRATES the UV pretty darn well.
PLEASE keep this in mind when choosing between a 6% or 12% bulb.
Folks that use 12% bulbs in other designs of fixtures may be over-doing it when using a 12% bulb in this particular fixture.
The 12% bulbs *pack a punch* when used in these fixtures because of how well the reflector concentates & reflects the rays.
And a 12% bulb used for Chams in this type of HO fixture could potentially over-do the UV if used on cages / set ups with:
A.
Perches set too close to the light.
B.
On baby Chams and shade loving species of Chams.
C.
When used over SMALLER CAGES.
D.
Cages without AMPLE SHADE.
Cages that are especially deficient in
shade UP at the TOP OF THE CAGE should checked for safe UV levels when using a 12% bulb in this particular style fixture.
(I have seen folks OVER-UV Chams with negative effects
when using 12% bulbs in these fixtures on the wrong type species / cage set-ups.)
If there is any doubt, always check with a Solarmeter. 
I am very familiar with these fixtures and I have imported them and worked with them for over 10 years now.
So...
I just have to add my 2 cents so people will be aware & for the welfare of all the chams out there
.
Cheers!
Todd
I often have a hard time wrapping my head around uvb, so if you don’t mind, I just want to make sure I understand you properly. If I buy a 24” Arcadia Pro T5 Shade Dweller kit, I will not be able to put anything other than the 7% uvb bulb in it? I can not put a ReptiSun 5.0, Arcadia 6% or anything else in that fixture (unless it is 14w)? 
) and finally did find/buy the Pro T5HO that I needed.
