Reducing LED intensity

qguy · 6th February 2008, 10:19 PM

What value of resistor (or a range of from 1 to 100 so that i can play with it) should i put to reduce the intensity by half of those 3mm, 2 volt LED- thanks

jol50 · 6th February 2008, 10:23 PM

What is your supply voltage? Most just play around with some to get it the way they want. Also if your supply changes with load consider that. I don't know if 1v would give half light output, I doubt it.

qguy · 6th February 2008, 10:35 PM

Have not checked the voltage, but should be under 4v

I cant change the power supply as the Amp is not a DIY, its a commercial amplifier. Blocking part of the light is also not possible for aesthetics reasons, so a resistor in series is my only option

Tube_Dude · 6th February 2008, 10:46 PM

Play with the current trough the LED.

10 mA is a good starting point...

jol50 · 7th February 2008, 05:14 AM

10ma is about 220 ohm. 5ma would be 430 according to a calculator on the net at 4v supply and 2v LED. So I guess I would get a 220 to 430+ ohm pot if possible, if the max current is 10ma. Or you know, put a 220 ohm on it and then a pot from 0 up to dim it. http://www.luxeonstar.com/resistor-calculator.php

qguy · 7th February 2008, 11:45 PM

Cant I just put a 500 ohm pot w/o a resistor ?

Tube_Dude · 7th February 2008, 11:53 PM

Put a 500 Ohms pot in series with a 100 Ohms resistor...

jol50 · 7th February 2008, 11:58 PM

Depending on max ma it can take, if you go lower ohms you could over power it.

Tube_Dude · 8th February 2008, 12:04 AM

Quote:

Originally posted by jol50
Depending on max ma it can take, if you go lower ohms you could over power it.

Usually a LED can take 20 mA without any worries ...

6th February 2008, 10:19 PM	#1
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	Reducing LED intensity What value of resistor (or a range of from 1 to 100 so that i can play with it) should i put to reduce the intensity by half of those 3mm, 2 volt LED- thanks __________________ na

6th February 2008, 10:35 PM	#3
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	Have not checked the voltage, but should be under 4v I cant change the power supply as the Amp is not a DIY, its a commercial amplifier. Blocking part of the light is also not possible for aesthetics reasons, so a resistor in series is my only option __________________ na

6th February 2008, 10:46 PM	#4
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Play with the current trough the LED. 10 mA is a good starting point... __________________ Jorge

7th February 2008, 11:45 PM	#6
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	Cant I just put a 500 ohm pot w/o a resistor ? __________________ na

7th February 2008, 11:53 PM	#7
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Put a 500 Ohms pot in series with a 100 Ohms resistor... __________________ Jorge


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6th February 2008, 10:23 PM	#2
jol50 diyAudio Member Join Date: Nov 2007	What is your supply voltage? Most just play around with some to get it the way they want. Also if your supply changes with load consider that. I don't know if 1v would give half light output, I doubt it.

7th February 2008, 05:14 AM	#5
jol50 diyAudio Member Join Date: Nov 2007	10ma is about 220 ohm. 5ma would be 430 according to a calculator on the net at 4v supply and 2v LED. So I guess I would get a 220 to 430+ ohm pot if possible, if the max current is 10ma. Or you know, put a 220 ohm on it and then a pot from 0 up to dim it. http://www.luxeonstar.com/resistor-calculator.php

7th February 2008, 11:58 PM	#8
jol50 diyAudio Member Join Date: Nov 2007	Depending on max ma it can take, if you go lower ohms you could over power it.

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