Your Quince did what it was supposed to do last fall - go dormant. But when you brought it in, the Quince thought spring had come early so did what they do in the spring: leaf out and bloom.
Its too late to stick it back outside this winter so a gro-light is your best option.
Next time, if you have hardy perennials that don't get planted, just put them up against the house in a protected spot or bury the pot in the ground. Hardy perennials are always happier outside.