Since jumping isn't limited by height any-way in 3.5, that makes Brawny Radiance strictly superior to Bounding Radiance except in the very rare cases that you need to super-charge something that uses its Dex for Jump.
Oh. Sorry. I thought that it was like back in 3.0. Anyway, as Brawny Radiance gives a bonus to strength score rather than strength modifier, it will still give only half the benefit of Bounding Radiance for the purpose of making jump checks. Of course, if you had at least two glows, you could use both simultaneously. However, if you think that Bounding Radiance is too weak, I could have it give double it's current bonus or something.