These bulbs are perfect. They already have the diode on them, so all you have to do is hook up the wires to a power source and go. You can use one color or mixed these with some other colors. They are perfect for hobby lighting, car, boat, industrial, camera, toys, DIY computing, costume design and more. Features: High quality material, flexible cable, easy to use. Just connect the positive and negative wires to your battery or power supply. 20cm long pre wired led with 3 or 5 or 10mm lamp beads. Energy saving, low power consumption. Perfect for hobby lighting, car, boat, industrial, camera, toys, DIY computing, costume design and more. Specifications: Wire Length: About 20cm or 7.87 LED Type(optional): 3mm Red( 1), 3mm Orange( 2), 3mm Blue( 3), 3mm Slow Flashing( 4), 5mm Red( 5), 5mm Orange( 6), 5mm Blue( 7), 5mm Slow Flashing( 8), 10mm Red( 9), 10mm Yellow( 10), 10mm Green( 11), 10mm Slow Flashing( 12) 3mm 5mm 10mm Pre Wired Line Diffused LED Diodes Forward Voltage(V) Dominant wavelength(mm)K Reverse current(uA) Power Angle(deg) If=20mA If=20mA Vr=5V Min Typ Min Typ Max Red 9.0 12.0 620 630 20 60 Yellow 9.0 12.0 580 590 20 60 Orange or Amber 9.0 12.0 515 520 20 60 Green 9.0 12.0 520 530 20 60 Blue 9.0 12.0 460 465 20 60 Slow Flashing 9.0 12.0 20 60 Package Includes: 50pcs x Pre-wired LEDs Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. The slow flashing LED is multicolored.