I have just got a Philips PCS150 Tri-One enlarger.
For those that don't know it this is an additive colour enlarger, rather than moving C, M and Y filters in front of the lamp it has three lamps and R,G and B filters.
There are no moving parts in the head, changes in filtration are achieved by altering the intensity of each lamp from the control unit.

The problem is that only one lamp is working and they are 14v 35w reflector halogens of 35mm diameter:
A search found that these lamps are used in dental equipment and are rather high priced, not earning as much as dentists do I am trying to find a cheaper supply.

Does anyone know any UK based suppliers that have suitable lamps at a reasonable price?