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GRIMMII
12-29-2007, 02:50 AM
Is there any way to trim 15 or 20 bulbs off of a 100 bulb strand of lights?

daviddth
12-29-2007, 03:50 AM
As mentioned in the chat, not really. There are ways, but often they are not worth the effort.

acewingman
12-29-2007, 04:01 AM
What I do when I have some left over at the end on my strand is fold a piece of black electrical tape over the bulb so it is invisible at night when it is lit.

Macrosill
12-29-2007, 09:36 AM
Or buy some black out caps. You can find them all year long at online retailers.

shocker
12-29-2007, 04:41 PM
or use shrink tube

Toaster
12-30-2007, 02:17 AM
From what I understand, those strings are "balanced" out to run at 110v (or whatever).... take one bulb out, and the others get too much juice.

On a side note: This being my first year with this kind of display: I realize NOW how important straight lines are, etc... The black tape is probably the cheapest, easiest way to "trim" excess.

GRIMMII
12-30-2007, 07:07 AM
Ccouldn't I make 2 50's out of a 100?

pixeldigger
12-30-2007, 09:41 AM
You CAN make 2 50's out of a 100.

Just follow the wires.in the middle, usually you'll find 2 consecutive bulbs with 3 wires in them, and only 2 between them. Thats where to make the cut.

When I do this, I also save the extra length of wire thats in the string for splicing into and extending strings.

Macrosill
12-30-2007, 09:48 AM
Grimm,
Read this: http://doityourselfchristmas.com/wiki/index.php?title=Shorten_Mini_Lights

ppohlman
01-09-2008, 05:22 PM
After cutting it into 2x 50-ct strands, can you add one of them directly onto the end of a different 100-ct strand to make a longer 150-ct one? Does that make sense?

Filament
01-30-2008, 02:55 PM
Is there any way to trim 15 or 20 bulbs off of a 100 bulb strand of lights?

In theory yes, mini lights are wired in series that is why if one goes out (and the shunt does not work) the strand goes out. It also requires all the light in the strand, usually 50, to provide enough resistance for 110 volt. If you remove lights from the 50 the resistance drops and therefore the amps go up and will burn out the lights. If you remove lights but replace them with the correct 110 volt resistor the lights should work at the correct amps.

The standard 2.5 volt light runs at about 7-8 ohms of resistance. So if you remove 10 lights you would need to have a resistor of about 70-80 ohms.

I am not an electronic engineer nor have I done this modification; it is just based on a basic knowledge of electronics and electricity.

Trepidati0n
01-30-2008, 03:00 PM
What is neat about cutting a 100 ct string into 2 50's is you can also covert a 100 count string into a 220V string with the same principal. ;)

kostyun
01-30-2008, 05:38 PM
One thing that I've done is to "splice" two sets of 100 to give me one set of 200 in length for my mega tree.

(And yes, I've kept the plug ends lol! - they can come in handy)

mmulvenna
01-30-2008, 07:35 PM
After cutting it into 2x 50-ct strands, can you add one of them directly onto the end of a different 100-ct strand to make a longer 150-ct one? Does that make sense?

Yes you can. I do it all the time when I make my wireframes.

Jeff Millard
01-30-2008, 08:06 PM
I busted up 100ct strings into 50s and removed all the wire. Then I twisted the 2 strings together and wrapped them around PVC to make arches. The leftover wire went to convert a set of 50 white LEDs into a set of lawn lights. One other thing. Putting 2 sets of 50 in series not only makes them work @ 220vac,it also makes them dim by around 50%. A good trick for sets you never want brighter than that. I make them for the bushes at the campground.

Jeff

jeffathompson
04-15-2008, 09:39 AM
I've posted a lot on craigslist and had a lot of lights given me. I get all sizes so I don't bother making different strings. Then the ones that don't work I just burn and sell the copper to by more components.

rlilly
04-24-2008, 09:52 AM
The leftover wire went to convert a set of 50 white LEDs into a set of lawn lights.

I've been thinking about converting an incandescent string to LEDs using my leftover LEDtriks LEDs.

When you did this, did you add a full wave rectifier?

Macrosill
04-24-2008, 10:04 AM
I've been thinking about converting an incandescent string to LEDs using my leftover LEDtriks LEDs.

When you did this, did you add a full wave rectifier?

Sounds like a good post for a new thread.