Free sample of 405nm UV diodes

[ryansoh3]

Wow, I've never seen a TO-46 package. How does it need to be heatsinked?

 

[The Lightning Stalker]

You do not need a driver for a LED, a resistor will work fine if you are using 12 volts as the supply a 200-300 ohm resistor is all you will need.

Exactly. They are either 20 or 50mA, 3.7V forward voltage, depending on which figure is the right one. So
say you are running from a 12V supply, the correct resistor value would be

R = (Vcc - Vf) / If

415Ω = (12 - 3.7) / 0.02

Wow, I've never seen a TO-46 package. How does it need to be heatsinked?

At 50mA, ambient air and the pin connections are more than enough to keep it cool.

 

[paul1598419]

Yes, and for 50mA you would use 166 ohm resistor. But, since these are uncommon values, I'd use either 390 ohms or 150 or180 ohms.