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How do I wire the High Power 1 Watt LED's?

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-db

Joined: Apr 24 2009
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Post Fri Apr 24, 2009 6:37 pm

I bought 2 of them (http://www.oznium.com/1w-led) to use as a dome light. How do I properly wire the 2 of them together? Parallel or series? Do I need resistors?
Tdawgthegreatest

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Post Fri Apr 24, 2009 7:04 pm

One LED on 14 volts would need about a 33 ohm / 6 watt resistor. No one makes a 6 watt resistor, so you'd have to use a bunch of smaller resistors to do this.

It is really not practical to use a resistor for a high powered LED.

You could wire 4 in series on 14 volts... 14 / 3.5 = 4


http://www.oznium.com/1w-led/questions
-db

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Post Fri Apr 24, 2009 7:29 pm

I saw that and it didn't seem to make any sense.

Line 1 says I need a 6 watt resistor if I'm using 1, so I would guess I would need a 3 watt if I have 2 of them?

Line 2 says it's not practical to use resistors, so that tells me resistors are not needed.

Line 3 says to wire 4 in series, so this seems to say you need to use 4 of them together. What is the 3.5 that the 14volts is being divided by and what is the 4 that is equals?

So, either the answer is really unclear to me, or I still don't have an answer.
PwrRngr

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Post Fri Apr 24, 2009 8:28 pm

If you wire two in series, you should get a resistor as close to 20 ohms as possible (3 watts or greater) and wire it in series w/ the two LEDs.

Line 2 says it's not practical. This doesn't mean that it's not needed. Due to the high wattage of the resistor (this is increased cost), it's much cheaper and easier to buy a voltage regulator.

A car voltage output is not typically 12V, it's closer to 14V. So, if you put 4 of these LEDs in series then it will come out to 3.5V per LED or 14V total.
byte

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Post Fri Apr 24, 2009 8:29 pm

Here are the spec for the bulbs you have:

DC Voltage: Min 2.79V, Typ 3.55V, Max 3.99V

EACH LED runs at 3.55 volts... your car runs about 14.4 volts...
2 LED's would run at 7 volts... great if you had a 6 volt battery...
3 LED's would run at 10.5 volts...
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Post Fri Apr 24, 2009 8:41 pm

Don't forget these 1 watters need to be on a heat sink, or they will get really hot and retire early.
Tdawgthegreatest

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Post Fri Apr 24, 2009 8:44 pm

^^^ Yep, which is why you shoulda just bought the 12v ready 1W Led Flood or spot. They already have a heat sink in it.
PwrRngr

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Post Fri Apr 24, 2009 9:00 pm

alienyoungjr wrote:
Don't forget these 1 watters need to be on a heat sink, or they will get really hot and retire early.

The 4th "Customer Question" says that they already have a built in heat sink. I'm not saying another one wouldn't hurt, but unless whoever answered the question is lying, he should be fine w/out one.
alienyoungjr

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Post Fri Apr 24, 2009 10:13 pm

PwrRngr wrote:
alienyoungjr wrote:
Don't forget these 1 watters need to be on a heat sink, or they will get really hot and retire early.

The 4th "Customer Question" says that they already have a built in heat sink. I'm not saying another one wouldn't hurt, but unless whoever answered the question is lying, he should be fine w/out one.


I will say that whoever answered that is not quite right.

Read this info about heat sinks for the 1 watters
http://www.luxeonstar.com/luxeon-heat-sinking.php
bad venge

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Post Sun May 03, 2009 7:11 pm

The ones I bought (prewired)have three 10 ohms 1 watt in series on BOTH leads they are heat shrinked in a heatwrap
alienyoungjr

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Post Sun May 03, 2009 8:59 pm

where did you buy these? link?
bad venge

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Post Mon May 04, 2009 6:26 pm

I bought them off a member here ... I'll try to find the link

http://superbrightleds.com/cgi-bin/store/commerce.cgi?product=ACCENTS

I bought like 100 one watters in different colors no housings just raw LED;s
alienyoungjr

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Post Mon May 04, 2009 9:25 pm

are you talking about these?
(#1) LUXART LED Module - SBL brand
User posted image

or these?
(#2)LUX3 series High Power LED Modules
User posted image

if yes, then both of these have adequate heat sinks and should be fine for any application.

the 1 watters that Oznium sells,
User posted image
these do not have heat sinks, and will not survive without them unless you use very low power.
PwrRngr

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Post Tue May 05, 2009 3:13 am

alienyoungjr wrote:
the 1 watters that Oznium sells,
User posted image
these do not have heat sinks, and will not survive without them unless you use very low power.

I suggest (this isn't directed toward you, it's directed toward someone from Oz) that the FAQ for the 1W LEDs be changed due to it saying they have a built in heatsink.
Cooper

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Post Tue May 05, 2009 4:15 am

In my experience those 1W's get hot enough to melt plastic, and if you use a single in-line resistor the resistor will also get hot enough to burn things up . To be honest, they're a really impractical product unless you fix them up with a proper heat sink and mount them in a waterproof area that can take the heat . icon_sad.gif
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Post Tue May 05, 2009 12:37 pm

maybe oz should think about selling these with heat sinks?
bad venge

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Post Tue May 05, 2009 5:42 pm

I got the second ones on the page non waterproof ..I got 100 or so of the 1 watters like OZ sells
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