PCBなしでLEDを使用できますか?

If you received actual 3W LEDs and were to run them at 3.5V, 700 mA without a heatsink, then yes, you will sooner-rather-than-later kill them.

You have three options.

1. Run them at a lower voltage/current.
2. Heat sink them, perhaps improvised out of some aluminum bar stock and metal epoxy (Home Depot)
3. Buy star PCB heat sinks and assemble them yourself.

#PCBアセンブリ

続きを読む: LEDPCBアセンブリ