That bulb seems like it will work fine, in addition to your other one. We all use 10 and 12% bulbs. Set at the correct height and checked with a meter, they will do no harm.
Your temps are too cool. Your basking area should get up to around 37. Think summer in Afghanistan. Its hot there. Try adding an additional 100watt incandescent bulb in its own fixture over near the other basking bulb. Adjust the height to get the temperature right. You also nee to keep night temps up all over the whole enclosure. Try for 24 all around while trying to keep the tortoise from hibernating.
Al this additional electric heat is going to dry things out, so be sure to keep your substrate damp, soak daily and offer a humid hide during this time. Once the tortoise snaps out of his lack of appetite, you can try to go back to more normal temps, but you still need a basking area warmer than 30.
If your house is cold and you have trouble achieving these temps you might consider using a large closed chamber instead of an open topped enclosure. That will make your tortoises life better and your life a lot simpler. Way cheaper on electricity too, since you use a fraction as much.
Your temps are too cool. Your basking area should get up to around 37. Think summer in Afghanistan. Its hot there. Try adding an additional 100watt incandescent bulb in its own fixture over near the other basking bulb. Adjust the height to get the temperature right. You also nee to keep night temps up all over the whole enclosure. Try for 24 all around while trying to keep the tortoise from hibernating.
Al this additional electric heat is going to dry things out, so be sure to keep your substrate damp, soak daily and offer a humid hide during this time. Once the tortoise snaps out of his lack of appetite, you can try to go back to more normal temps, but you still need a basking area warmer than 30.
If your house is cold and you have trouble achieving these temps you might consider using a large closed chamber instead of an open topped enclosure. That will make your tortoises life better and your life a lot simpler. Way cheaper on electricity too, since you use a fraction as much.