It looks like that's a "cool side, warm side" tortoise. One that requires different temperatures. So I think a basking bulb is a good idea.
That works for RFs and Radiata, but not as well for other species.
For all the species I keep and raise, I like the basking bulb to be set on a timer and on all day to simulate the sun and give them a place to go get warmer than ambient. Sulcatas, South African leopards, and Burmese stars. Other people's experience have demonstrated that this is not needed for radiata. I will be following Dan's @Sterant example whenever I get radiata babies.
As @Tom mentioned, I do not use basking bulbs for radiata (never have). In some cases I use basking bulbs for adults, but even then they are only on for 1 hour in the morning and 1 hour in the afternoon. If you have your temperatures and UVB correct, they don't need it. They will, very rarely, bask under the UVB tubes. Another consideration at my place is that I do not heat individual enclosures, I heat the entire room, so I don't have any CHE's or heating elements of any type inside the enclosure. Just the 2 bulb fluorescent fixture that holds my UVB bulb and a 6500K bulb. This method, along with keeping the RH above 85%, in my experience yields perfectly smooth and healthy radiated tortoises. Again, I am only talking about Radiated tortoises here. I also happen to be raising a baby bowsprit tortoise in this same method, but I can't speak to the results yet as it is only a few weeks old.
The closed chamber I keep radiated babies in gets to 33c during the day and drops to 20c at night. Within the chamber, there are cooler sections (under hides) that are about 30c, and if the tortoises "bask" under the UV bulbs, they can get their body temp up to about 37c as read with an infra-red heat gun. I'm concerned that if you continue to use the basking bulb, and the tortoise hangs out there a lot, the carapace will get desiccated and you will get pyramiding even if the viv is humid. If you have the ability to heat the room differently and remove the basking bulb, that's what I would do. Others will do things differently, but thats what works for me.
