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Old 09-11-2008, 11:11 PM   #61
sherman
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If I have more 4 w led will be better.
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Old 26-11-2008, 02:47 PM   #62
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Bad news .. I think I got a bad batch of luxeon V. All my luxeon V have clouded lens .



Well .. time to change the luxeons out for CREE XR-E.
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Old 18-12-2008, 12:36 PM   #63
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Attached an excel spreadsheet of the light measurement
Attached Files
File Type: doc 2 ft T5HO light reading.doc (40.5 KB, 260 views)
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Old 05-01-2009, 10:56 PM   #64
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Where you guys get the luxeon LED from?
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Old 06-01-2009, 02:39 AM   #65
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Quote:
Originally Posted by Kazuo View Post
Where you guys get the luxeon LED from?
i think bro barra mentioned supplied from www.ledsupply.com
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Old 06-01-2009, 11:47 AM   #66
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Oh... no locally huh?
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Old 17-01-2009, 12:37 PM   #67
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IS LED DRIVER A MUST FOR HIGH POWER LED? I planning to connect them as if they are normal low current LED setup. 12VDC (Laptop charger with a few Amps) + resistor + LED = Light

I bought 10 x 3W White LED... got the shipment and I tested using a 9V batt with 100Ω... With this I should get around 40mA running through the LED. 2 out of 10 are dead. When I talked to the supplier, they replied they will not replace the LED as I use Batt+resistor to power them. They claimed that this will burn the LED. trying to BS me!

These 3W LED runs on 3.5V and 700mA. How can a mere 40mA killed it! what logic?

Last edited by Limsteel; 17-01-2009 at 12:47 PM.
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Old 18-01-2009, 02:12 PM   #68
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Quote:
Originally Posted by Limsteel View Post
IS LED DRIVER A MUST FOR HIGH POWER LED? I planning to connect them as if they are normal low current LED setup. 12VDC (Laptop charger with a few Amps) + resistor + LED = Light

I bought 10 x 3W White LED... got the shipment and I tested using a 9V batt with 100Ω... With this I should get around 40mA running through the LED. 2 out of 10 are dead. When I talked to the supplier, they replied they will not replace the LED as I use Batt+resistor to power them. They claimed that this will burn the LED. trying to BS me!

These 3W LED runs on 3.5V and 700mA. How can a mere 40mA killed it! what logic?
Where you got them from?
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Old 18-01-2009, 06:06 PM   #69
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got them from Ebay.
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Old 18-01-2009, 10:22 PM   #70
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I wouldnt advise using resistors to drive your LEDs. Its difficult to regulate the voltage and current at the same time. Resistors are also not power efficient thus using more power than required.

If you want 40mA, you should be using 150ohm, 1/2watt resistor with a 9V supply. That would be good for testing but not good for driving these high powered LEDs.

To drive at 700mA, you will need 15ohm, 7.4watt with 12V supply. To drive all 10 LEDs using resistors. You will be wasting at least 10watts of power heating the resistors.
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