24" for a 40 + gallon tank -https://www.pangeareptile.com/collections/fixtures/products/zoo-med-reptisun-t5-hood?variant=26907425734756 this will come w/ a 5.0 bulb keep it for a back up the distance and placement is different from the bulb you need
22" Zoo Med ReptiSun 10.0 UVB T5 HO
or this one found at Pet Smart this site is currently out of stock
24 watt Arcadia ProT5 12% UVB Bulb With Hood you want the 12% bulb --
these are good fixtures and you also need the probe thermometers
2 of them one for basking side and one for your cool side
and a digital probe hygrometer - place on the back center wall of your tank - optimal humidity is 40-50% nothing under 20 or over 70%
when you get the UVB please let me know I will help you get it placed for your tank - your screen is going to determine where it goes
22" Zoo Med ReptiSun 10.0 UVB T5 HO
or this one found at Pet Smart this site is currently out of stock
24 watt Arcadia ProT5 12% UVB Bulb With Hood you want the 12% bulb --
these are good fixtures and you also need the probe thermometers
2 of them one for basking side and one for your cool side
Zoo Med Digital Thermometer
Measure the temperatures within your terrariums and reptile cages easily with this digital thermometer by Zoo Med! Order temeprature and humidity guages from Pangea Reptile.
www.pangeareptile.com
Exo Terra Digital Hygrometer | Dubia.com
Use the Exo Terra Digital Hygrometer to track the humidity levels in your reptile or amphibian terrarium, available here at Dubia.com!
dubiaroaches.com