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These are the type of UVB bulb you need to look for ...
TUBES
COMPACTS
The 50W that you have now is definitely not a UVB emitting Bulb.
Your heat bulbs, should be above the tank, where you BD can not possibly have access to it, most have them in dome fixtures on top of a screen for obvious reasons. It is much easier to get accurate temps with a Digital thermometer with a probe in the right spots & is highly recommended. If you choose to use a tube UVB (My preference), it may be more cost effective to purchase an 18"-24" under the cabinet fixture from your local hardware store, remove the plastic cover, discard it & replace the bulb with the specialty UVB Bulb. Do not let anyone talk you into using an MVB (Mercury Vapor Bulb) in a 20 gal.
Good Luck
TUBES
COMPACTS
The 50W that you have now is definitely not a UVB emitting Bulb.
Your heat bulbs, should be above the tank, where you BD can not possibly have access to it, most have them in dome fixtures on top of a screen for obvious reasons. It is much easier to get accurate temps with a Digital thermometer with a probe in the right spots & is highly recommended. If you choose to use a tube UVB (My preference), it may be more cost effective to purchase an 18"-24" under the cabinet fixture from your local hardware store, remove the plastic cover, discard it & replace the bulb with the specialty UVB Bulb. Do not let anyone talk you into using an MVB (Mercury Vapor Bulb) in a 20 gal.
Good Luck