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.WinFam01":1pzkmx9e said: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)
KarrieRee":5igdgs01 said: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
SHBailey":148ysqxu said: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.
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.SandP":uexxopcf said:Can you show us a pic of the screen? In most cases it should be fine sitting on top.
I thought of that, but they are quite expensive.SHBailey":1of2n2wn said: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.
Hm, that's a thought.kingofnobbys":1az6v3y9 said:SHBailey":1az6v3y9 said: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 :
Calc / measure area per mesh open and diameter of the wire
Shading = d/(G+d) as fraction. .