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Cutting up LED lights from xmas string

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  • Member since
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Cutting up LED lights from xmas string
Posted by rrebell on Tuesday, December 7, 2021 10:17 AM

Can you just slice and dice and splice to make it shorter or longer if needed. Got an extra string of the micro wire type LED's that works from batteries and has a remote. Thought this would work great in my roundhouse but way too many lights.

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Posted by Pruitt on Tuesday, December 7, 2021 10:31 AM

I think so. The string I used in my roundhouse is all wired in parallel. If you have a series-wired one it won't work, To check simply cut off the LED at the farthest end of the string fro the battery. If the rest still light they're wired in parallel.

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Posted by rrebell on Tuesday, December 7, 2021 10:40 AM

Even in series can you just rcconect the two end wires together, and solder it?

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Posted by gmpullman on Tuesday, December 7, 2021 10:42 AM

I'm not sure what your "string" looks like exactly but I've been using plenty of these with (for me) great success:

 IMG_4762 by Edmund, on Flickr

The tiny SMD LEDs are encased in a blob of clear resin of some kind. I cut them to the length or number of lamps I need, usually no more than 8 or 9 LEDs. More will require a larger wattage resistor. 1/4 watt can get pretty warm, 1/2 watt is better.

 IMG_4759_fix by Edmund, on Flickr

There's 100 LEDs on a string of soft copper wire. I strip away the third wire and save it for use as HO "hose". The lacquer insulation takes a little scraping, plus heat to clean it off.

I use an LED tester to find out which wire is anode and mark them with red and black sharpies just so I don't get mixed up.

 IMG_4765 by Edmund, on Flickr

I use these in passenger cars where their spacing is nearly ideal for even lighting, especially in a sleeping car where I can place each lamp where it will do the most good in stead of shining light down the middle of a walled-off corridor.

This Walthers car shows my homemade keep alive, too:

 ATSF_10-6_Pine-King-wire by Edmund, on Flickr

In this car I retained the former lighting kit prism and replaced the incandescent lamps with the strind LEDs wrapped around the supports:

 Sleeper_lights-crop by Edmund, on Flickr

The overhead lighting in this roundhouse was done with the string LEDs. I cut them into lengths that provided eight LEDs for illuminating each aisle between "bays" and added more as needed around the perimiter.

 RH_lights5 by Edmund, on Flickr

They don't completely replace my use of individual LEDs but for larger structures and passenger cars they're ideal. Nice warm glow to them, too.

Good Luck, Ed

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Posted by CSX Robert on Tuesday, December 7, 2021 10:50 AM

rrebell

Even in series can you just rcconect the two end wires together, and solder it?

 Generally not.  When wired in series they usually use a resistor to limit current and the value of the resistor is based on the total voltage drop of the LEDs.  If you remove LEDs without changing the resistor you'll have more current flowing through the LEDs, and if it's too much they burn up.  If you add LEDs you'll have less current and dimmer or possibly not lit at all LEDs.

 

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Posted by rrebell on Wednesday, December 8, 2021 10:35 AM

gmpullman

I'm not sure what your "string" looks like exactly but I've been using plenty of these with (for me) great success:

 IMG_4762 by Edmund, on Flickr

The tiny SMD LEDs are encased in a blob of clear resin of some kind. I cut them to the length or number of lamps I need, usually no more than 8 or 9 LEDs. More will require a larger wattage resistor. 1/4 watt can get pretty warm, 1/2 watt is better.

 IMG_4759_fix by Edmund, on Flickr

There's 100 LEDs on a string of soft copper wire. I strip away the third wire and save it for use as HO "hose". The lacquer insulation takes a little scraping, plus heat to clean it off.

I use an LED tester to find out which wire is anode and mark them with red and black sharpies just so I don't get mixed up.

 IMG_4765 by Edmund, on Flickr

I use these in passenger cars where their spacing is nearly ideal for even lighting, especially in a sleeping car where I can place each lamp where it will do the most good in stead of shining light down the middle of a walled-off corridor.

This Walthers car shows my homemade keep alive, too:

 ATSF_10-6_Pine-King-wire by Edmund, on Flickr

In this car I retained the former lighting kit prism and replaced the incandescent lamps with the strind LEDs wrapped around the supports:

 Sleeper_lights-crop by Edmund, on Flickr

The overhead lighting in this roundhouse was done with the string LEDs. I cut them into lengths that provided eight LEDs for illuminating each aisle between "bays" and added more as needed around the perimiter.

 RH_lights5 by Edmund, on Flickr

They don't completely replace my use of individual LEDs but for larger structures and passenger cars they're ideal. Nice warm glow to them, too.

Good Luck, Ed

 

Those are what I am talking about, give a glow and are not too bright for HO. I was going to keep the battery part as it is remote controled but there are too many lights for my roundhouse on one string and another place (a building complex), not enough. Suppose I could just black out the too many but that still leaves the not enough (was going to cut of the not need on the one to add to the other).

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Posted by hornblower on Thursday, December 9, 2021 2:03 PM

Several years back, I purchased several 100 LED strings of warm white Christmas lights from Home Depot the day after Christmas. The prices were significantly reduced so it was quite reasonable to buy several strings.  

It did take a bit of time to disassemble each string to retrieve the individual LED's but it was well worth the effort.  I doubt I'll ever run out of these LED's.

The 3mm LED's in these light strings are of an inverted cone design that reflects most of the light out the sides of the LED's (perfect for building lighting).  However, I also discovered that the point of the inverted cone still allows quite a bit of light to escape out the tip of the LED.  In fact, these LED's work great as headlights because the light greatly resembles the look of an incandescent headlight.  Not only is the color right, but the light comes from a small point source in the middle of the LED.  I like to use these LED's for the headlights in all my EMD F7 locos.  I use Testors Clear Parts Cement or Krystal Clear to form headlight lenses in the loco shells and mount the LED's inside the shell directly behind the lenses. Great look!

Hornblower

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Posted by ndbprr on Friday, December 10, 2021 8:11 AM

Prototypically speaking every heavy industry building I have been in is extremely well lit to reduce injury related issues.  That being said if we are modeling a steam era roundhouse I really don't know how well it would have been lit.

 

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Posted by rrebell on Friday, December 10, 2021 8:54 AM

ndbprr

Prototypically speaking every heavy industry building I have been in is extremely well lit to reduce injury related issues.  That being said if we are modeling a steam era roundhouse I really don't know how well it would have been lit.

 

 

Only well enough to get the job done but that depends on era too.

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