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

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Re: T8 question

Postby kingofnobbys » Fri Jun 05, 2020 9:46 pm

WinFam01 wrote:Please be kind, this is a work in progress.
[Click image to enlarge]

Her current bulb is *not* a 13w, it is a 26w, which is why I had been thinking it was ok. *I now know it is not*.
Measurement from inside top of screen straight down to top of "mountain" (which is her basking spot) is 9.5".
Measurement from inside top of screen straight down to top of rock structure is 12".

My conclusion, if I have come to it correctly, is that with the current set-up, a T8 (inside!) would be indicated.
BUT, because I read that T8 emits a different wavelength of light which may be seen by reptiles as a flicker that doesn't sound pleasant,
https://www.reptilecentre.com/blog/2016/09/difference-t8-t5-reptile-uvb-tubes/
I do wonder if we could have the correct distance for a T5 (inside!) if we were to make the top of the rock the basking spot instead? But then her body (& especially head), would not be 12" from the uvb, so I'm not sure?

Sorry for all the detailed questions! This is just the way my brain works at trying to make sure I understand correctly.🙈


I use 26W UVB200 CFBs in Exo Terra Nano Hoods mounted under the lid of my rearing tubs, no screen obstructing them so my dragons get very good levels of UVA & UVB at about 20cm from the closest point on the globe .
In your case based on the shading factor I worked out for your screen mesh lid, your dragon will not be getting anywhere near enough UV unless it can get as close as 2cm to the 26W 10% UVB CFB .

In the short term if the 26W 10% UVB CFB is under 3 months old, you could retire the dome it's in and invest in a Exo Terra Nano Hood , and mount that under the mesh , this will get you out of trouble until you can upgrade to a good T5 reflector hood and a T5 UVB tube of sufficient penetrating power and UVB rating to match your current tank or perhaps a future larger forever home for the dragon.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : Gutzy (F) 27Sep19, Fluffy (F) rescued injured by lawnwacker 14Nov17, 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.
G.Dubia Gecko (F) hatchling : Godzilla
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Re: T8 question

Postby WinFam01 » Sat Jun 06, 2020 9:17 pm

I've managed to slide the screen partially off to expose her directly to the uvb for now.

I had a thought...
What about a T5 reptisun 5.0 bulb?? (Instead of the 10.0 I usually see recommended)
Would that make it so we could go with the T5 fixture inside and be able to get the correct distances?

I found this...
The ReptiSun® 5.0 is effective for UVB induced photo conversion of vitamin D3 in reptile's skin at distances up to 12″. A full 5% UVB output allows vitamin D3 synthesis to occur naturally, preventing or reversing MBD and other health problems in Turtles, Bearded Dragons, Iguanas, and other diurnal reptiles.
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Re: T8 question

Postby kingofnobbys » Sat Jun 06, 2020 11:24 pm

WinFam01 wrote:I've managed to slide the screen partially off to expose her directly to the uvb for now.

I had a thought...
What about a T5 reptisun 5.0 bulb?? (Instead of the 10.0 I usually see recommended)
Would that make it so we could go with the T5 fixture inside and be able to get the correct distances?

I found this...
The ReptiSun® 5.0 is effective for UVB induced photo conversion of vitamin D3 in reptile's skin at distances up to 12″. A full 5% UVB output allows vitamin D3 synthesis to occur naturally, preventing or reversing MBD and other health problems in Turtles, Bearded Dragons, Iguanas, and other diurnal reptiles.


CAREFUL with falling for the advertising hype " effective range " of a UV source
see this viewtopic.php?f=34&t=234800

Essentially all the claim of effective at a given distance means is that some UVA and UVB will be DETECTABLE using a SENSITIVE ( microW range ) SOLARMETER , it says nothing about how healthy the UVA and UVB flux will be at such near non-existant doses ( the reptile will never be able to accumulate sufficient UVA and UVB to stay healthy ).

I've already give flux vs distance charts for a similar power T8 ( in my chart it's the Arcadia T8 6% UVB tube ), so take the UVB at any given distance and adjust by 5/6 and you will have a good estimate for the UVB flux for the T8 5% UVB tube with or without reflector or reflector hood .
Aim to read off about 190 microW UVB / sq cm at the basking spot and about 100 microW UVB / sq cm in the warm zone and you'll be fine.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : Gutzy (F) 27Sep19, Fluffy (F) rescued injured by lawnwacker 14Nov17, 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.
G.Dubia Gecko (F) hatchling : Godzilla
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Re: T8 question

Postby KarrieRee » Sun Jun 07, 2020 4:41 am

5.0 bulbs are more for a aquarium use I would stick w/ the 10.0 -- better strength
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Re: T8 question

Postby WinFam01 » Sun Jun 07, 2020 7:48 am

T5 5.0, not T8.

Edited to add...I found a "Reptisun 5.0 terrarium hood" that's actually in stock, and it comes with a Reptisun 5.0 bulb is why I'm asking.
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Re: T8 question

Postby KarrieRee » Sun Jun 07, 2020 8:03 am

The 5.0 bulb is not as strong as the 10.0 -- my hoods came w/ the 5.0 - I swapped out the 5.0 for the 10.0-- just order the 10.0 bulb and when you get the hood take out the 5.0 use as a back up -- it would be equivalent to a T 8 strength
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Re: T8 question

Postby kingofnobbys » Sun Jun 07, 2020 8:55 am

WinFam01 wrote:T5 5.0, not T8.

Edited to add...I found a "Reptisun 5.0 terrarium hood" that's actually in stock, and it comes with a Reptisun 5.0 bulb is why I'm asking.


If you can arrange the basking spot to be 6" to 8" from the t8 5% UVB tube ( in a reflector hood , under the mesh ) it'll be fine .
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : Gutzy (F) 27Sep19, Fluffy (F) rescued injured by lawnwacker 14Nov17, 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.
G.Dubia Gecko (F) hatchling : Godzilla
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Re: T8 question

Postby SHBailey » Sun Jun 07, 2020 9:52 am

kingofnobbys wrote:
WinFam01 wrote:T5 5.0, not T8.

Edited to add...I found a "Reptisun 5.0 terrarium hood" that's actually in stock, and it comes with a Reptisun 5.0 bulb is why I'm asking.


If you can arrange the basking spot to be 6" to 8" from the t8 5% UVB tube ( in a reflector hood , under the mesh ) it'll be fine .


This is a new one on me -- I never thought it would be ok to use a 5.0 under any circumstances, but I know Kingofnobbys to be very knowledgeable about such things.

We have a T5 HO 10.0 lamp on top of a screen (which cuts out about 30% of the light according to the meter) and our beardie's basking platform is about 10-12 inches from the top of the tank where the lamp sits. I check it with the meter about once a month so I'll know if the output drops, otherwise I replace the tube about once a year according the the manufacturer's instructions. Our beardie seems to be doing well with this setup -- his little skeleton looks good with X-rays. But this is just one example of something that works. There's obviously more than one way to give your beardie the UV that he/she needs.

I had a problem with those fancy terrarium hoods. Several of them shorted out on me where the cord connects to the hood. We finally got a cheap one without the hood -- minimalist with nothing much more than the reflector and the sockets to plug the tube into, but with a detachable cord that can be replaced if necessary. Not much to look at, but so far so good. If I remember correctly, I got it from Pangea Reptile, and it cost almost as much as the lamp itself to ship it to Alaska. :(

I don't know why almost all of them come with a 5.0 tube. :?
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Re: T8 question

Postby KarrieRee » Sun Jun 07, 2020 9:56 am

I dont know why either - I think they were thinking more for aquarium use than for reptiles- I got both my Zoo Med fixtures from Pangea and have had 0 problems w/ them -- I went w/ the Acradia 14% bulbs since I have tanks 24" high but am switching to the 12%'s - one tank is already using the 12% and the 14% will be replaced in Aug--
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Re: T8 question

Postby WinFam01 » Sun Jun 07, 2020 4:01 pm

Well what do you know?! I had looked at those "plain" fixtures at Pangea, but was going to go for the hood I had found elsewhere until I read what SH said...and when I went back to Pangea to take another look, it gave me an option for pick-up, because the warehouse is only about 30 minutes from where I live!
I think I am going to go with the T5 Reptisun 5.0 though - I just don't think I have the depth in this tank to get her 12-15" away from the T5 10.0. Even if we made the rock structure her basking spot instead of the mountain, she'd be closer than 12".
From the mountain basking spot she will be around 7" from the T5 5.0.
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Re: T8 question

Postby KarrieRee » Sun Jun 07, 2020 5:04 pm

Lucky you --- I just ordered from there today --- the 5.0 will work its equivalent to a T8 so your distance should be 8-10 inches
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Re: T8 question

Postby SHBailey » Mon Jun 08, 2020 7:54 am

As long as the fixture fits the tube, the tube is what matters as far as the amount of UV you get, at least as long as it has a reflector. If you have a Reptisun T5 HO (made by Zoo Med and the kind I use) then (if I remember correctly) your beardie should be no closer than 6 inches from the lamp, otherwise it can harm their eyes. I have never used the Arcadias, but I understand that they are also high quality and a lot of people like them.

On rare occasions, our beardie stands up against the glass right under his UV lamp, which puts his eyes within the danger zone, so I turn off his "pretty color" for a little while since he doesn't seem to understand me when I tell him, "Don't do that -- you'll go blind," but on the other hand, "Don't get too far away from it either or you'll get MBD." Catch 22. Aren't reptiles fun. :roll:
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Re: T8 question

Postby kingofnobbys » Wed Jun 10, 2020 3:03 am

SHBailey wrote:
kingofnobbys wrote:
WinFam01 wrote:T5 5.0, not T8.

Edited to add...I found a "Reptisun 5.0 terrarium hood" that's actually in stock, and it comes with a Reptisun 5.0 bulb is why I'm asking.


If you can arrange the basking spot to be 6" to 8" from the t8 5% UVB tube ( in a reflector hood , under the mesh ) it'll be fine .


This is a new one on me -- I never thought it would be ok to use a 5.0 under any circumstances, but I know Kingofnobbys to be very knowledgeable about such things.

We have a T5 HO 10.0 lamp on top of a screen (which cuts out about 30% of the light according to the meter) and our beardie's basking platform is about 10-12 inches from the top of the tank where the lamp sits. I check it with the meter about once a month so I'll know if the output drops, otherwise I replace the tube about once a year according the the manufacturer's instructions. Our beardie seems to be doing well with this setup -- his little skeleton looks good with X-rays. But this is just one example of something that works. There's obviously more than one way to give your beardie the UV that he/she needs.

I had a problem with those fancy terrarium hoods. Several of them shorted out on me where the cord connects to the hood. We finally got a cheap one without the hood -- minimalist with nothing much more than the reflector and the sockets to plug the tube into, but with a detachable cord that can be replaced if necessary. Not much to look at, but so far so good. If I remember correctly, I got it from Pangea Reptile, and it cost almost as much as the lamp itself to ship it to Alaska. :(

I don't know why almost all of them come with a 5.0 tube. :?


Sales policy get the NOOBs to return to upgrade to that stronger 10%UVB or higher tube would be my guess.
CBDs: Cleopatra & Caesar born 28Jan19.
Puff (RIP 10Dec15),Rex (RIP 16Mar17),Toothless (RIP 26Nov17).Peppa (RIP 22Mar19).
EBTSs : George & Mildred (born july 2010).
EWSs : Gutzy (F) 27Sep19, Fluffy (F) rescued injured by lawnwacker 14Nov17, 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.
G.Dubia Gecko (F) hatchling : Godzilla
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Re: T8 question

Postby WinFam01 » Wed Jun 10, 2020 8:55 pm

We're going tomorrow to pick up the fixture and bulb. I ended up deciding to get an Arcadia 6% (T5) so that it would be a bit stronger than the 5.0.
Hopefully I made an ok call without asking here first.
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Re: T8 question

Postby KarrieRee » Thu Jun 11, 2020 4:59 am

Get the 12%-- its a better bulb-- and if your getting it from Pangea I dont know if they have any-- I am not familiar w/ out put for the 6% bulb -- I use the Arcaida 12 and 14 in my tanks - the 14's are for tanks w/ a height distance of 24" or better - and since my tanks are 24" I can get away w/ it - the 14's are a real strong bulb - someone else will haft to comment on the 6% bulb
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