Hi,
Do tortoises necessarily need sunlight and won't a good UVB bulb be enough? I think the answer is a yes and know. There are some good bulbs in the market today but nothing can be a substitute for the sun.
You have mentioned that the Burmese brown will be housed indoors but you haven't said what size enclosure you can afford to provide for it. Remember that the brown tortoises can grow to be 50 pounds or larger. At this size the concern is not just about an UVB source but also the size of the enclosure because without adequate exercise the animal will end up being fat and maybe even obese.
I have sulcatas, leopards, burmese brown, redfoots, pancake, russians, elongated and hermanns's and they all spend the summer months outside and in the winter they have an adequte sized heated indoor enclosure and you can see that they use every inch of it.
Yes Indian stars can be maintained indoors, for that matter any tortoise can be, as long as you have a big enough enclosure.
Michael