DIY LED lighting - Page 7

09-11-2008, 11:11 PM

If I have more 4 w led will be better.

BarraCuda™ · 26-11-2008, 02:47 PM

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.

18-12-2008, 12:36 PM

Attached an excel spreadsheet of the light measurement

05-01-2009, 10:56 PM

Where you guys get the luxeon LED from?

PatrikLim · 06-01-2009, 02:39 AM

Quote:

Originally Posted by Kazuo

Where you guys get the luxeon LED from?

i think bro barra mentioned supplied from www.ledsupply.com

06-01-2009, 11:47 AM

Oh... no locally huh?

Limsteel · 17-01-2009, 12:37 PM

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?

BarraCuda™ · 18-01-2009, 02:12 PM

Quote:

Originally Posted by Limsteel

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?

Limsteel · 18-01-2009, 06:06 PM

got them from Ebay.

BarraCuda™ · 18-01-2009, 10:22 PM

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.

17-01-2009, 12:37 PM	#67
Limsteel Arofanatic Join Date: Feb 2003 Posts: 289	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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09-11-2008, 11:11 PM	#61
sherman Guest Posts: n/a	If I have more 4 w led will be better.

26-11-2008, 02:47 PM	#62
BarraCuda™ SiaoGu Gives You Wings Join Date: Jul 2001 Posts: 4,169	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.

05-01-2009, 10:56 PM	#64
Kazuo Guest Posts: n/a	Where you guys get the luxeon LED from?

06-01-2009, 11:47 AM	#66
Kazuo Guest Posts: n/a	Oh... no locally huh?

18-01-2009, 06:06 PM	#69
Limsteel Arofanatic Join Date: Feb 2003 Posts: 289	got them from Ebay.

18-01-2009, 10:22 PM	#70
BarraCuda™ SiaoGu Gives You Wings Join Date: Jul 2001 Posts: 4,169	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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