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There is a chart listing commonly used lamps in the instruction sheet or here - http://lowel.com/prolight/prolight_b.html#info
The 125 watt version of that lamp is the FSH.
We have found the FVM 105 watt and FVL 200 watt lamps to be more durable with similar outputs as the higher wattage lamps. If your Pro-light is pre April 2003 you will need to stick to the GCA and FSH lamps unless you update or modify the light.