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UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 11:27 am
by Mflav
Hello everybody my Oscar has a T5 HO 10.0 reptisun 22” UVB light. As of right now I have it on top of the screen but I was told that takes away 50% of UVB entering into the tank. Do you suggest I cut out that part of the screen below it or I just leave it as is? The brand said it’s fine to be on top of the screen but I keep hearing otherwise any advice would help and I’m sure Oscar would appreciate it[Click image to enlarge]

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 11:29 am
by KarrieRee
As long as basking spot is 12-15 inches on top of screen and cover is off the bulb meaning bulb is exposed it should be fine where it is--- the T 8 bulb is not as strong and would need to be inside the tank
Karrie

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 1:11 pm
by claudiusx
Moved by Moderator from General to Enclosures

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 1:14 pm
by claudiusx
Hi there,

Currently, how far is your bulb from the basking surface?
That will determine what you want to do.

The screen doesnt block 50%, more like around 30%

The recommended distance for a t5 unobstructed with a reflector would be 12-15 inches.

Since it being on a screen cuts it around 30%, youd want to be around 9~inches away

So it all depends on your setup and how close your dragon can get to the bulb.

-Brandon

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 3:09 pm
by kingofnobbys
My advise is ALWAYS UNDER the mesh (any mesh) for the UV source and it's hood or dome. NEVER ontop.
The mesh can easily block over 50% the UVA & UVB (especially fine wire mesh) see
Image
ref http://www.uvguide.co.uk/fluorescenttubemeshtests.htm

You can work out how much UV is blocked
Image

Simple arithmetic
the shading fraction is 1- (G^2/(G+2d)^2) where G is the open length, the d is diameter of the wire.

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 3:15 pm
by Mflav
Thanks so much....I measured and it’s exactly 9” from basking above screen 👍🏼👍🏼👍🏼

Re: UVB light on screen or Below???

PostPosted: Sun Oct 20, 2019 5:39 pm
by claudiusx
Great then you're perfect :D

-Brandon