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mechie said:Your 10v bulbs will be wired in series of 24 bulbs across a high (mains 240v) voltage, typical christmas tree style.
mechie said:If any one bulb fails the whole string would go out so the manufacturers use special bulbs which go short-circuit when the filament fails. This is OK if just one bulb fails (giving 240v/23 bulbs = 10.44v) but if a second one goes the problem worsens to 10.9v per bulb. Eventually this over-running causes further failures and the whole string goes dead-short across the mains :shock:
By fitting one so-called fuse bulb (a normal filament lamp), if this blows the whole string is safely killed - you know (in theory!) that this is the cause of the string failing so is easily found and fixed.
mechie said:All you need then is a bulb that will run on the 10v, 1.3W (0.13A) that is available without being over-run (too bright) so that there is a point in the circuit that can fail open circuit (a fuse). 12v 1.5W may be dimmer than the other bulbs but could be easy to find and cheap :wink:
davepusey said:I would be happy to use a 12V bulb but the problem i'm having when trying to get them is that nobody sells this specific fitting. See image below.
Nigel Goodwin said:It looks like a fairly standard christmas tree light fitting, you may be able to get replacements at a lighting outlet - although you will probably have to ask.
Nigel Goodwin said:But probably the first place to look is where you bought them from, they should be able to help you - either by sourcing the bulbs for you, or giving you details of where you can get them from.
davepusey said:Well i bought them from safeway and i dont think they can help.