LED Specs

[biferi]

I am looking at this LED
https://www.sparkfun.com/products/11118

Am I right that if I use 3.0 Volts I will get 16,000mcd?

But if I use 3.4 Volts I will get 20,000mcd?

I know it takes 80mA to Run.
Thanks.

 

[(*steve*)]

No, it means at 80mA the voltage across them will be between 3.0V and 3.4V and the light outut will be between 16000mcd and 20000mcd.

The actual intensity is not guaranteed to be correlated with Vf at a particular current.

 

[Colin Mitchell]

I can buy superbright LEDs for 5 cents and get 20,000mcd at a current of 17 mA so these LEDs are real junk.

 

[(*steve*)]

Colin, without comparing the half angle you are just going off half-cocked (again).

 

[Colin Mitchell]

Mine is 15 degrees half angle. Do you want to compare anything else????

You can get 290,000mcd for 5 cents 20 pcs for $1.04 delivered to your door via private personalised immediate courier.

Source Material: InGaN !
Emitting Colour: 0.5W 10MM HI POWER White 0.5W LED
LENS Type: Water clear
Luminous Intensity-MCD: Typ: 290,000 mcd
Reverse Voltage: 5.0 V
DC Forward Voltage: 3.2 ~ 3.4V
DC Forward Current: 100mA
Viewing Angle: 40 degree
Lead Soldering Temp: 260°C for 5 seconds
Power Dissipation: 500mW

 

[(*steve*)]

Yeah, can you compare your post to the question asked?

 

[KJ6EAD]

18,000 millicandelas @ 30° = 3.854 lumens

20,000 millicandelas @ 15° = 1.075 lumens

http://led.linear1.org/lumen.wiz

 

[Audioguru]

An LED is supposed to be fed a limited current, not just a voltage. Post a video of your LED instantly burning out when you connect 3.4V to it.