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 7.9 Inch 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: 126088462

Details

Brand
EDGELEC
Bulb Base
E26
Bulb Shape Size
B9
Light Type
LED
Special Feature
Lightweight

⏳20,000+ hours lifespan for long-lasting brilliance

🌈6 vibrant diffused colors, 120 LEDs total

🔋Prewired with built-in resistor for plug & play

€ 31.76

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Light up your projects with color and confidence!

VIBRANT SPECTRUM - Assorted 6-color kit (White, Red, Yellow, Green, Blue, Orange) to elevate any creative or functional lighting setup.
VERSATILE APPLICATION - Perfect for hobbyists, electronics, décor, and instructional lighting—indoor or outdoor ready.
EFFORTLESS INTEGRATION - Prewired 7.9-inch leads with pure copper core for seamless DIY and professional projects.
ENDURANCE YOU CAN TRUST - Over 20,000 hours of reliable illumination—engineered to outlast and outperform standard LEDs.
OPTIMIZED BRIGHTNESS EFFICIENCY - 0.25W power consumption with 120° wide viewing angle ensures bright, energy-smart lighting.

This EDGELEC 120-piece LED kit features prewired 5mm LEDs designed for 12V DC systems, offering six diffused colors with built-in resistors for easy installation. Each LED boasts a 20,000+ hour lifespan, 120° viewing angle, and low power consumption, making it ideal for DIY electronics, decorative lighting, and professional projects seeking vibrant, durable illumination.

Specifications

ASIN	B07PVVL2S6
Accepted Voltage Frequency	100 to 240 Volts and 50 Hertz to 60 Hertz
Additional Features	Lightweight
Best Sellers Rank	#10,898 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in LED Lamps #15 in Diodes
Brand	EDGELEC
Brand Name	EDGELEC
Bulb Base	E26
Bulb Diameter	0.39 inches
Bulb Shape Size	B9
Color	[01] 6 Colors X 20 Pcs / 120 Pcs
Connectivity Technology	Normal bulb
Control Method	Touch
Controller Type	Push Button
Customer Reviews	4.7 out of 5 stars 1,771 Reviews
Incandescent Equivalent Wattage	37.5 watts
Indoor Outdoor Usage	Indoor, Outdoor
Item Dimensions W x H	0.39"W x 0.53"H
Item Weight	7.36 ounces
Light Color	Red
Light Output Maximum	300 lumens
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	5mm
Model Number	PW-DIP LED
Number of Items	1
Package Quantity	120
Power Consumption	0.25 watts
Power Source	Corded Electric
Shape	Round
Special Feature	Lightweight
Specific Uses For Product	Indoor
Style Name	5mm
UPC	611355171996
Unit Count	1 Count
Voltage	12 volts_of_direct_current
White Brightness	30 lumens

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