Using these 25 - pack 10mm diffused yellow LEDs is easy. First, you can simply insert them into a breadboard for your project. They're very visible during the day, so they're great for projects where daytime visibility is important. When it comes to power, make sure to provide a forward voltage between 1.85 - 2.5V at 20mA current to get the typical 1000 mcd brightness. As for maintenance, keep them away from excessive heat and moisture. If you have any issues or questions while using these LEDs, refer to our 'Introduction to using LEDs' tutorial. It'll help you out with any electronics project you're working on.