I've confirmed (via the product listing on Amazon) that this is a Sony made replacement bulb - seller has good reviews as does the product. It also comes with a 6 month warranty. Advertised as "Brand New Factory Original Lamp".
Since installing it everything was great, but recently the set goes bright/dark in quick succession resulting in a blinking that lasts up to a minute. Once it stops the TV looks great and won't have this blinking problem for almost an hour or so. The issue happens on all channels and with DVDs, etc.
I called Sony and they asked me to reset the TV by unplugging it from the power source for two minutes. Otherwise, they suggested contacting a service technician, but my suspicion is it's the bulb (I don't plan on paying $100 to be told it's a bulb problem).
I tried resetting the TV but the problem hasn't stopped so I've contacted the seller to confirm the manufacturer and to facilitate a replacement/refund so we'll see what happens.