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Author Topic: LED's anyone recommend?  (Read 1510 times)

henly1234

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LED's anyone recommend?
« on: July 10, 2015, 03:51:46 PM »

... Im thinking of replacing all my grain of rice bulbs with led's, Id like to know if you think its a good idea and whats required for q 12v system?
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Time Bandit

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Re: LED's anyone recommend?
« Reply #1 on: July 10, 2015, 04:14:11 PM »

It is a good idea if you use proper resistors.
The LED will not fail in the next 50 years if you limit the current to 15mA  :}
You just need to remember that the usual 3mm LED do not emit like a normal bulb. Thatīs why I use 0603 or 1206 SMD LED.
Those have 140° emitting angle.

12V system is fine, you can put 3-5 LED (depending on color) in series and limit the current by a proper resistor.
Just use one of the calculators in the net.


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regards

Tobias

Stan

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Re: LED's anyone recommend?
« Reply #2 on: July 10, 2015, 04:25:45 PM »

HI Henley p/m sent.

Stan.
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Colin Bishop

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Re: LED's anyone recommend?
« Reply #3 on: July 10, 2015, 04:30:26 PM »

Or just buy 12v LEDs with the resistors built in! You can buy them in 3mm or smaller micro versions.

Colin
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Stavros

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Re: LED's anyone recommend?
« Reply #4 on: July 10, 2015, 07:57:44 PM »

Component shop for ALL your led's
 
Dave
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inertia

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Re: LED's anyone recommend?
« Reply #5 on: July 10, 2015, 09:29:00 PM »

Be aware that 0603 SMD LEDs are 3mm long x 2.2mm wide. That's about the size of a cooked grain of basmati rice. Soldering manually is thus a little tricky   :o
Unless you are Stan Reffin, who does a special sort of magic  8)
DM
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Time Bandit

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Re: LED's anyone recommend?
« Reply #6 on: July 10, 2015, 10:25:13 PM »

Not soo difficult at all if you use double-sided adhesive tape to hold them and laquered wire.
I have soldered hundrets of them but killed a lot of them in the beginning. Now my failure rate is maybe 1%.

Not sure about the UK but there is a german seller on fleabay who also sells prewired SMD LED:
http://www.ebay.de/itm/10x-LED-PUR-WEISS-0603-Litze-Modellbahn-Birne-Licht-pure-white-SMD-wit-603-/371334510206?pt=LH_DefaultDomain_77&hash=item567542f67e
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Tobias

Fastfaz

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Re: LED's anyone recommend?
« Reply #7 on: July 11, 2015, 08:44:05 AM »

   Stavros is spot on the Component shop is the place for your LED's, I have used their bright led's with a resistor on the positive side very successfully running on 12 volts each led having its own supply i.e. + and - , what I did was to trim the led tails (the long one is the positive and they only work one way) then put a small crocodile clip at the led end as close as possible to the led then solder the wire on, the clip acts as a heat sink consequently the led doesn't get fried. Trust me if I can do this anyone can my soldering leaves an awful lot to be desired. Hope this helps.
    Cheers,
        Faz. :-)) :-)) :-)) :-)) :-)) :-)) :-))
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