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"Of course the other unthinkable possibility is that TFTs vary so much in quality that you can't be sure if you'll get a bright or dim one." Well to summarize this thread, someone claimed that the TP screen was significantly dimmer than a PB screen. I contested this. Later the original poster noted that he had been comparing the screen in economy battery mode with the PB, and yes of course the TP is then not as bright, no question, but also no surprise, and also easily changable if that is what you want. So I think we have no great mystery here. In full power mode, machines are comparably bright, with TP in dim mode, it is dimmer :-)