WE've got several sets of Christmas tree bulbs and also some other
similar bulbs used for parasol lights etc.

They all have the same type of plastic base and bent wire terminals, but
are of different voltages and wattages.

Some retailers stock some bulbs, but there are some that we can't match.

Is there a dealer who specialises in thses sort of bulbs ? The usual
suspects like RS and CPC don't appear to stock much of this type.

If the original instructions have been lost, is there an easy way to
determine the correct volt and power rating of a given bulb ?