Like all RPTVs (except the new LED DLPs) it requires a high intensity light bulb as the illumination source, so yes, it needs bulb changes. In general these bulbs seem to have a min of 1000 hours with an average of closer to 3000 hours.
Patrick, HD sets with PIP are few and far between due to the cost and complexity of including 2 ATSC tuners. The XBR2 Sonys have single tuner PIP-set's tuner for one pic and any external input for the second.