What‘s the difference between bulb and lamp?

Projector lamps explained Is it a bulb or is it a lamp?

What"'s the difference?

A projector bulb is exactly that, the bulb. If you purchase a bulb you will need to, very carefully, fit that bulb into the bulb housing. It is quite a technical procedure and not one we recommend.

A projector lamp is the complete unit, bulb + housing. The housing will already have the bulb fitted, so you simply have to remove the old housing from the projector and fit the new one. This method is far more convenient than fitting a bulb only.