This may (or may not) relate to a BIG problem setting up the bulbs. They can absolutely fail to register unless you temporarily disable mobile data (3G/LTE) on your phone. The setup’s crappy logic never finishes because the phone reverts to using its mobile data and not the bulb’s ad hoc network.
I was waiting upwards of 20 minutes with no success. As soon as I disabled mobile data I had two bulbs registered in 2 minutes.