hello if i order these what else will i need ?

Thread Starter

dvan

Joined Feb 8, 2014
39
ok i have a heatsink and a power supply but i keep ruining these leds so im gonna try something else
 

bertus

Joined Apr 5, 2008
22,118
Hello,

What powersupply do you have?
For powering leds, you will need a constant current powersupply, as given in the link.

Bertus
 

bertus

Joined Apr 5, 2008
22,118
Hello,

Those power supplies are constant voltage.
When there was no current limiting used with that power supply, the leds will get ruined.
As stated on the page of the leds, they need to be driven with a current of 350 mA.

Bertus
 

wayneh

Joined Sep 9, 2010
17,189
You could use your existing supply if you place a current-limiting resistor in series with the LEDs.

The choice of resistor value is determined by the desired current (eg. 75% of the maximum spec of the LED), the number of LEDs in series (each has a Vf spec), and the voltage of the supply. The power rating of the resistor should be at least double the expected dissipation, calculated as I^2*R or ∆V*I.
 
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