Unplug the power cord and put on gloves.
Remove the 2 vent grille mounting screws. Slide the vent grille forward to remove it.

Remove the light cover screw.

Pull the light cover forward and lift up the bulb holder.

Replace bulb with a 30 watt appliance bulb.
Insert the light cover, and tighten the light cover screw in place.
Slide the bottom of the vent grille into place. Push the top in until it snaps into place. Insert and tighten the vent grille mounting screws.
Plug in the power cord and set the clock.