KodaK EKTAGRAPHIC MODEL E2 SLIDE PROJECTOR (by 3 users)

You can use an ENH lamp which is 250 watts. it costs more (shop around- margins are high on lamps) but lasts an average of 175 hours vs the 300 watt ELH lamp at 35 hours.

You can also get ELH and ENH lamps from Wiko and Fuji in a "-5" version, ie ELH-5. It's built for 125 volts rather than the typical actual house voltage of 110-120 v. This allows them to burn much longer. There is a marginal lowering of light output in these forms.