On Nov 18, 12:36 am, "James Sweet" wrote:
"**THE-RFI-EMI-GUY**" wrote in message

...





Don't try to short out the safety bulb, or you will have a fire. It is
there to act as a fuse.

As the "shunt" bulbs burn out, the voltage (and current) accross the
remaining bulbs increases thus accelerating failure of remaining "shunt"
bulbs. Eventually the "safety" bulb in the string blows out. The solution
is to replace "shunt" bulbs whenever they blow out. Delayed too long, the
"safety" bulb goes as well.

I would string a new set of lights on the worst branches this year and
replace the tree next year for safety's sake.

2500 lights, thats a lot of lights!

When did this "safety bulb" thing come about? This thread is the first I've
ever seen or heard of it. Is it a European thing or is this here in the US?
Every string of miniature series lights I've ever seen has all identical
shunted lamps and a fused plug.- Hide quoted text -

- Show quoted text -

James,

Thank you for the information. I got this tree 5 years ago and this
is the first time I have seen this ""safety bulb" I no longer have
the directions to the tree, but will take a picture of this special
lamp and sent it to you.

It does look exactly like the other bulbs, except that it's base is
white and it is permanently installed into it's base, as if it were
molded in. Each layer of branches has its own string of lights; they
either plug into the previous string or into a main extension cord
that traverses the trunk of the tree. Each layer of branches/string
of lights has one of these bulbs.