I got some new bulbs in a pack of 6 made by Haraq. Type R39, E17, 25 watt. They seem to work fine and last a lot longer than the original bulbs that were supplied with the lamp. I still think I would like a dimmer, described on this thread. The Haraq bulb is on the left in the photo, original 40 watt bulb on the right in the attached photo. The 40 watt bulbs did not last more than 24 hours in my lamp.