T8 question - Updated with new light pics - did I get it?

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T8 question - Updated with new light pics - did I get it?

Postby WinFam01 » Fri May 29, 2020 5:47 pm

If I get a T8 fixture for a uvb bulb and attach it on the underside of the screen top, does it need to have a reflector? (Tank is 36x18x18)
Last edited by WinFam01 on Sun Jun 14, 2020 11:12 am, edited 1 time in total.
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Re: T8 question

Postby kingofnobbys » Fri May 29, 2020 9:11 pm

WinFam01 wrote:If I get a T8 fixture for a uvb bulb and attach it on the underside of the screen top, does it need to have a reflector? (Tank is 36x18x18)

Yes , even the strongest T8 UVB tube ( a 12% UVB ) will need a very good reflector above / around it's back half in a tank 18" tall.

ImageImage

You are better off investing in a 24W T5ho UVB tube rated AT LEAST 10%UVB and a reflector will be needed for this unless the dragon can get close enough when basking to get about 180 microW UVB / sq.cm.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : , Fluffy (F) rescued injured by lawnwacker 14Nov17, Gutzy (F) rescued 27Sep19 - RIP 3Aug20 (est 12 yo), Wriggles (F) - injured rescue, over 8 yrs old, RIP 2Feb16 old age. Lucky juvenile (M) - cat attack rescue (lost r-eye, broken r-lower jaw), fatal SI RIP 21Jul2010.
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Re: T8 question

Postby KarrieRee » Sat May 30, 2020 4:35 am

yes you want a reflector w/ any tube fixtures - it maximizes the UVB rays --- and most recommend T 5 especially for bigger tanks 40 + gallon -- T 8's are good just not as strong as the T 5's
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Re: T8 question

Postby kingofnobbys » Sat May 30, 2020 11:00 am

KarrieRee wrote:yes you want a reflector w/ any tube fixtures - it maximizes the UVB rays --- and most recommend T 5 especially for bigger tanks 40 + gallon -- T 8's are good just not as strong as the T 5's
Karrie


In that a T8 will not have the UV penetrating power of a T5ho with the same UVB rating (and UVA rating too ) .

Spend a few dollars more and buy a T5 and T5 reflector hood rather than the T8 versions , your dragon will benefit from this greatly.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : , Fluffy (F) rescued injured by lawnwacker 14Nov17, Gutzy (F) rescued 27Sep19 - RIP 3Aug20 (est 12 yo), Wriggles (F) - injured rescue, over 8 yrs old, RIP 2Feb16 old age. Lucky juvenile (M) - cat attack rescue (lost r-eye, broken r-lower jaw), fatal SI RIP 21Jul2010.
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Re: T8 question

Postby WinFam01 » Sat May 30, 2020 6:51 pm

I thought T5s should be mounted outside the tank?

The screen on her tank is really thick, not like the usual silverish mesh, so I had been thinking I would put a T5 on top of it. But then I started thinking the screen would block too much of it, so thought a T8 inside would be better. Plus I can't find the Arcadia 12% for T5 I wanted in stock anywhere. :/
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Re: T8 question

Postby KarrieRee » Sat May 30, 2020 7:19 pm

The T 5 has options if it's mounted inside basking decor should be 12-15 inches-- on top of screen 8-10 inches-- try reptilesupply for the bulb they were awaiting an order coming in-
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Re: T8 question

Postby WinFam01 » Sun May 31, 2020 7:25 am

That's the thing, if I mount it inside I don't think I can get it that far away - her current basking spot is only about 6 inches from the screen. I would have to have something no higher than about 3 inches, and she would definitely be much closer some of the time on some of her furniture. 🤷🏻‍♀️
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Re: T8 question

Postby KarrieRee » Sun May 31, 2020 7:33 am

So if you leave it on top of screen get your basking decor piece 8-10 inches under it -- you can work w/ decor pieces that will work --
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Re: T8 question

Postby SandP » Mon Jun 01, 2020 7:43 am

Can you show us a pic of the screen? In most cases it should be fine sitting on top.
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Re: T8 question

Postby SHBailey » Mon Jun 01, 2020 12:01 pm

It might be a good idea to invest in a UV meter. Then you can tell how much your beardie is getting though the screen and at various distances from the lamp.
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Re: T8 question

Postby kingofnobbys » Wed Jun 03, 2020 7:59 am

SHBailey wrote:It might be a good idea to invest in a UV meter. Then you can tell how much your beardie is getting though the screen and at various distances from the lamp.


Or find a local keeper who has a unit who is will to come and take those measurements for you perhaps .

or measure your screen as shown below :
ImageImage
Calc / measure area per mesh open and diameter of the wire
Shading = d/(G+d) as fraction. .
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : , Fluffy (F) rescued injured by lawnwacker 14Nov17, Gutzy (F) rescued 27Sep19 - RIP 3Aug20 (est 12 yo), Wriggles (F) - injured rescue, over 8 yrs old, RIP 2Feb16 old age. Lucky juvenile (M) - cat attack rescue (lost r-eye, broken r-lower jaw), fatal SI RIP 21Jul2010.
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Re: T8 question

Postby WinFam01 » Wed Jun 03, 2020 12:27 pm

SandP wrote:Can you show us a pic of the screen? In most cases it should be fine sitting on top.

Let's see if this shows it well enough - I lifted up the access flap to get a shot straight through, and the 2nd is a shot of it from straight above. A 100 watt basking bulb would not get the top of the basking decor (any 6-7 in. away) past 95, we had to go to a 150.
[Click image to enlarge]

[Click image to enlarge]
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Re: T8 question

Postby WinFam01 » Wed Jun 03, 2020 12:32 pm

SHBailey wrote:It might be a good idea to invest in a UV meter. Then you can tell how much your beardie is getting though the screen and at various distances from the lamp.

I thought of that, but they are quite expensive.
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Re: T8 question

Postby WinFam01 » Wed Jun 03, 2020 12:36 pm

kingofnobbys wrote:
SHBailey wrote:Or find a local keeper who has a unit who is will to come and take those measurements for you perhaps .

or measure your screen as shown below :
ImageImage
Calc / measure area per mesh open and diameter of the wire
Shading = d/(G+d) as fraction. .

Hm, that's a thought.
King, I think you must be an engineer - or a rocket scientist. 😂

Not sure if this stuff it's made of would count as mesh - it's metal that I can tap on and make a sound. (That's the way my brain works and how I explain stuff - very technical, isn't it?) 🤣
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Re: T8 question

Postby KarrieRee » Wed Jun 03, 2020 12:39 pm

That to me is mesh--- and it would block 30% of the T 8's rays --- it needs to go inside the tank if that is what your trying to determine
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