EDGELEC 120pcs 12V LED Lights Emitting Diodes, Pre Wired DC 12 Volt 5mm LED (6 Colors x 20pcs) Assorted Kit Diffused Colored Lens- White Red Yellow Green Blue Orange Small LED Lamps

Q: I don't understand the need for the resistors. they don't step down the voltage and the led will only draw the amperage it needs without them?

You cannot connect an LED direct to any voltage without a resistor, as it is not a linear resistance. Below a certain voltage, it won't conduct or light, but above a certain voltage (between 2-3 volts for typical LEDs) the LED will suddenly conduct large amounts of current resulting in very high power dissipation. Even if the LED does not burn out quickly, it will run hot. The resistor is installed in series with the LED to prevent that. I have used various colors of pre-wired EDGELEC LEDs available on Amazon, and they work very well off a range of voltages from 7 to 12 volts, and draw around 10 mA. The White LEDs are high efficiency, and are surprisingly bright, such that a single one could be used for a flashlight.

Q: can these leds be used in an automotive application? (12v, high amperage)

they are 12v, will draw the current they require. not sure your high amperage comment?

Q: Using a 12v source, is it common that the resistor is burning hot almost melting the heatshink over the resistor??? different power and 10 LEDs sofar

No, it should not get that hot.

Q: what gauge wire are they?

Looks like 24 or 26. I have to double the wire to use in a crimped connector like a power pole.

Product ID: 307221330

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Details

Brand
EDGELEC
Light type
LED
Special features
Lightweight
Bulb shape/size
B9
Incandescent equivalent wattage
37.5 Watts

⏳20,000+ hrs lifespan

🎨6 vibrant colors

🔋12V stable power

Description

💡 Light up your projects with pro-grade LED power!

PRECISION WIRING - 7.8-inch pure copper wire leads with tin coating for superior conductivity and easy soldering
WIDE BEAM IMPACT - 120° diffused lens ensures broad, even light distribution for standout visibility
COLOR YOUR CREATIVITY - Assorted 6-color kit to elevate any DIY or professional project
ENDURANCE THAT SHINES - Over 20,000 hours of reliable, long-lasting illumination
PLUG PLAY BRILLIANCE - Prewired with built-in resistor for effortless 12V integration

The EDGELEC 120pcs 12V LED kit features prewired 5mm LEDs with built-in 0.25W metal film resistors, ensuring stable operation at 12V DC. With six diffused colors (white, red, yellow, green, blue, orange) and 20 pieces each, this set offers versatile lighting options. Each LED comes with 7.8-inch 7-core pure copper wire leads coated with tin for excellent conductivity and easy soldering. Designed for durability, these LEDs boast a lifespan exceeding 20,000 hours and a wide 120° viewing angle, perfect for DIY, hobbyist, and professional lighting projects.