That would be a "spot" bulb. It will focus too much carapace desiccating UVA into too small of an area and cause pyramiding if your tortoise is still growing. Better to use a Flood bulb for basking and an HO tube for UV, if needed.Description says that '' Exo Terra SUN GLO 75 w focus '' and i have no idea about uvb light thanks now.
GreekThat's a basking light. For a small area of heat.
It provides no UV.
What type of tortoise do you have?