One of the hardest parts to deal with as far as HDTVs are concerned is the availability of parts. Especially if they are damaged or start to show some problems, repair centers would normally have a hard time looking for replacement lamps for a particular model. Well, just in case, here is a Sony XL-2400 Replacement Lamp for Grand WEGA 3LCD Rear Projection HDTV which may be of help.
For compatibility, check out your unit. If it falls anywhere along these models, then you are in luck! The models where this replacement bulb can be used include: KDF-55E2000, KDF-50E2000, KDF-46E2000, KDF-E42A10 and KDF-E50A10.
The part costs $159.98 at Amazon.