Your power supply is rated at 29.3v at 2.7A. If you do the arithmetic, you get 79.11 watts. The recommended lamp is 30v80w. Underrun slightly, you will be within the capacity of the power supply. The 24v bulb was brilliant, but would have a short life with much bluer light. Your output voltage must be dead on with the lamp spec, or your colour temp will be way off. If the voltage takes a detectable interval to reach spec, the unit requires repair.