I have a customer with 4 x I Solutions ishow dj light units that use the popular A1/259 24v 250w lamp. I supply them Phillips 500 hour lamps which they get through 1 a week, despite only using the lights for 6 hours a night!! It sounds like an overvoltage at the lamp (25v or more)and they just burn out to quickly. I haven't had a chance to remove a unit just yet to confirm this. Is there a way of putting a metal clad high power resistor in line with the positive feed to the lamp to reduce the voltage, to increase the life of the lamp? It may be slightly dimmer, but they will get used to it!!

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