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You can find replacement projector lamp here: https://www.amazon.com/gp/search/ref=...
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How to replace lamp bulb on overhead celling Hitachi projector :
1) turn off and unplug the projector
2) remove the lamp cover on the side of the projector
3) remove three Phillips screws holding the lamp
4) take out the old lamp
5) get a lamp compatible with your particular projector
6) install the new lamp
7) secure the lamp with three Phillips screws
8) install the lamp cover
9) test the projector
10) reset the lamp counter

Watch how to reset Hitachi projector lamp counter here:    • How to reset Hitachi projector flashing LA...