Based on my experience of 24V 50W halogen (Impossible to find locally, so bought a load, when I could) improving ventilation of the holder GREATLY extended life, (Went from eating a bulb every few weeks to can't remember when last changing one)
All that I did was to use a rat tail file to produce two diametrically opposed slots, 8mm deep in the rim of the reflector.
This is the worklight that came fitted to my Engineers ToolRoom BL12 – 24. Warco BH600 and Chester Craftsman are almost identical machines, so they, and their successors, may use a similar lamp.
H T H
Howard