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I had an ARB bumper on my H3. I replaced both of the fogs. If they are the same, you have to open up the light, remove the bulb and replace it. I soldered on a new pig tail for use with my stock wiring. I don't remember the size of the bulb unfortunately. The whole thing took about an hour. So yes, they can be replaced, sorry I can't be of more help.
Google: ARB Fog Light Bulb Replacement
There are a few nice tutorials on how to do it. I sold my H3 a few years ago otherwise I would snap some photos myself.
If you mean it's a sealed beam, the whole lens/reflector/filament assembly comes out of the housing and gets replaced as a unit. Kind of old school, but possible. I find it hard to believe that ARB would sell a disposable fog light. Have you called ARB?It's a sealed unit.
All the bulbs in our fog lights are replaceable. Takes a spaded H3 55w bulb.