Im using some rope lighting as a lighting effect in the coving round my
bedroom, problem is the rope light is longer than my permitere of room, and
if i cut at the cut marks its too short, can i cut between the marks and
wire that section to work still, can't be that hard surely? Don't i add a
loop in or something?
Most of these type of lights have the lamps wired in series, so you'd also
have to add a resistor equivalent to the lamps you have removed. Although
each lamp might only be low voltage, the transformerless ones will have high
voltages from 12-240v along the string.
many thanks for your reply, these lights are mains (uk 240v) powered, didn't
think about the need for a resistor as well does that mean the short segment
will shine brighter otherwise? Or if the resistance is too low i gather the
voltage may be too high and blow the remaining lights?
Now i just need to know how i add my own loop and what resistance value i
need i guess? I need to do it now as i've just cut 1ft off the end and that
segment is now very much darker than the rest oops.
looks like i've got the answer, just an FYI
Take the wattage and work back from there. US (120v) Duralight is 18 bulbs
per segment, 8.25w @120v (.06875a). The whole segment looks like a 1.8k
resistor (roughly) so each bulb looks like a 100 ohm resistor. If your
lights are still 8.25w per segment at 240v each bulb you cut out is 200 ohms
or so. Add up the number you cut and use the appropriate resistor or as
close as you can get bearing in mind the proportion of that 8w is resistor.
It will be a fat one.
If the resistance is low the lights will be brighter.
I have quite often seen the 'remaining' lighted section covered with
black (opaque) insulating tape, or sufficiently large heat-shrink
tubing. If it is necessary to have a light-coloured finish,
heat-shrink tube usually has a matt surface which could be painted (?)
The excess length could be hidden behind the other end of the lighted
Don't forget that if a resistor is to be used with a cut string, make
sure it's power rating is *more than* the lamps replaced or it will
get dangerously hot or burn out.
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