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Coloured LED "filament" lamps for external use ?

broadgage
I am about to put up my Christmas lights, which this year will include a mains voltage festoon of the traditional type. 40 B22 lamp holders moulders onto tough rubber cable.

I propose to use coloured LED "filament" lamps made by BELL LIGHTING.

These give an impressive light for only 4 watts, and in very striking saturated colours.


On receiving the lamps, I am rather concerned to observe that they are "for indoor use only"

Does anyone know why ? they certainly look waterproof, with a glass bulb directly sealed to the metal cap, and with only 4 watts wont get hot enough for cold rain to shatter the glass.

I am inclined to use them, but don't like ignoring the instructions.

The festoon will  be connected to the mains via an isolating transformer to prevent any electric shock to earth, and an RCD as a second line of defence.

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    sounds like you do not have the same problem as we did, or at least the sample ones you have tested are watertight.

    unless it is being routed in reach of folk likely to take the bulbs out and put their fingers in, I'd not bother with the isolation transformer, personally, also  once you have the transformer, the RCD does not do a lot for you, as it can not detect secondary side damage.

    Normally we'd just put 230V festoon straight onto the mains via RCD (or 2 equal lengths in series between 2 phases if no neutral is available, but that is not an official method)

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    sounds like you do not have the same problem as we did, or at least the sample ones you have tested are watertight.

    unless it is being routed in reach of folk likely to take the bulbs out and put their fingers in, I'd not bother with the isolation transformer, personally, also  once you have the transformer, the RCD does not do a lot for you, as it can not detect secondary side damage.

    Normally we'd just put 230V festoon straight onto the mains via RCD (or 2 equal lengths in series between 2 phases if no neutral is available, but that is not an official method)

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