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.

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?

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.

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.

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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

Product ID: 307221330

Details

Brand
EDGELEC
Bulb base
E26
Bulb shape/size
B9
Light type
LED
Special features
Lightweight

🌈6 vivid colors x 20pcs

🔋20000+ hrs lifespan

🔌Prewired w/ resistor

B/.58

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Description

🌟 Light up your ideas with 120 vibrant LEDs—because your projects deserve to shine!

VIBRANT SPECTRUM - 120 LEDs in 6 diffused colors (White, Red, Yellow, Green, Blue, Orange) to elevate any project or décor.
EFFORTLESS INTEGRATION - Prewired with built-in 0.25W resistor for stable 12V operation—plug & play perfection.
LONG LASTING BRILLIANCE - Over 20,000 hours of reliable illumination—outshine the competition without frequent replacements.
VERSATILE DIY ESSENTIAL - Perfect for hobbyists, electronics, lighting projects, and creative professionals craving colorful, dependable LEDs.
DURABILITY MEETS PRECISION - 7.8-inch 7-core pure copper wire leads with tin coating ensure superior conductivity and easy soldering.

This 120-piece LED kit features prewired 5mm diffused LEDs in six vivid colors, each with a built-in resistor optimized for 12V DC circuits. Designed for easy soldering and long-lasting performance, these LEDs offer over 20,000 hours of illumination with superior conductivity thanks to pure copper wire leads. Ideal for DIY electronics, decorative lighting, and professional projects, this versatile set delivers stable, vibrant light output with minimal hassle.

Specifications

ASIN	B07PVVL2S6
Additional Features	Lightweight
Brand Name	EDGELEC
Bulb Base	E26
Bulb Shape Size	B9
Color	[01] 6 Colors X 20 Pcs / 120 Pcs
Color Temperature	3000 Kelvin
Connectivity Technology	Normal bulb
Control Method	Touch
Controller Type	Push Button
Country of Publication	China
Customer Reviews	4.7 4.7 out of 5 stars (1,687)
Efficiency	1200 lumens per watt
Incandescent Equivalent Wattage	37.5 Watts
Indoor Outdoor Usage	Outdoor
Item Dimensions W x H	21.2W x 1.8H centimeters
Item Weight	209 g
Light Color	Multicolored (White, Red, Yellow, Green, Blue, Orange)
Light Source Operating Life	20000 Hours
Light Source Type	LED
Light Source Wattage	0.25 Watts
Light Type	LED
Manufacturer	EDGELEC
Manufacturer Part Number	ED_DLP03D
Material Type	Metal
Model Name	PW-DIP LED
Model Number	PW-DIP LED
Number of Items	1
Package Quantity	120
Power Consumption	0.25 Watts
Power Source	Electrical (DC)
Shape	Round
Specific Uses For Product	Indoor
Style Name	5mm
UPC	611355171996
Voltage	12 Volts (DC)
White Brightness	30 Lumens

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