Actually knock off lamps can and will cause issues, these are not simple "bulbs". You can measure the resistance in a simple "bulb", try it with one of these lamps. These take thousands of volts to fire and then must maintain a specific spec to keep fired. The ballast does not "just" fire the lamp, it keeps it lit.
Toshiba DLP's are notorious for being picky with lamps.
You don't have to stay with the manufacture since they do not make the lamps but should stay with only quality names for life and function.
Knockoff housings cause more issues yet, I personally have run into that, where I ended modifying a OEM compatible lamp and housing to work.