I don't see why not,so long as the bulbs are the same type fitting.Better to start with 100w & go down in size than the other way round.Just incase there is a difference in the size of the wiring used on the 100w & 50w version.
Kev
The CB2 uses the 50watt bulb which gives 1million candlepower, it is the Lazerlite basically. The Blazerlite uses the 100watt bulb which gives 2 million candlepower. They do make it confusing CB2 = Lazerlite without the battery basically !
You can't put a 100 watt bulb in the Lazerlite/CB2 as it will basically melt your cable and connections ( I