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

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: 374368866

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 colors, 120 LEDs for versatile projects

🔋12V DC ready, no extra resistors needed

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€ 19.38

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Light up your innovation with effortless, vibrant power!

DIY DREAM KIT - 120 LEDs in one set—perfect for hobbyists, educators, and pros who demand quality and variety.
PREMIUM CONDUCTIVITY - 7.8-inch 7-core pure copper wire with tin coating ensures flawless electrical flow and easy soldering.
COLOR YOUR CREATIVITY - Six vivid diffused lenses (White, Red, Yellow, Green, Blue, Orange) to make every design pop.
PLUG PLAY BRILLIANCE - Prewired with built-in 0.25W resistor—just connect and glow without fuss.
ENDURANCE THAT OUTSHINES - Over 20,000 hours of reliable illumination—your projects stay lit longer than ever.

This 120-piece LED kit features prewired 5mm LEDs with built-in resistors optimized for 12V DC circuits, offering over 20,000 hours of lifespan. With six diffused colors and premium copper wiring, it’s the ultimate all-in-one solution for DIY electronics, decoration, and educational projects.

Specifications

ASIN	B07PVVL2S6
Accepted Voltage Frequency	100 to 240 Volts and 50 Hertz to 60 Hertz
Average Life Span	20000 Hours
Best Sellers Rank	32,374 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 62 in LED Diodes
Brand Name	EDGELEC
Bulb Base	E26
Bulb Shape Size	B9
Colour	[01] 6 Colors X 20 Pcs / 120 Pcs
Connectivity Technology	USB
Control Method	Touch
Controller Type	Push Button
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (3,065)
EU Energy Efficiency Label	1200 lumens per watt
Incandescent Equivalent	37.5 Watts
Indoor Outdoor Usage	Outdoor
Item Dimensions W x H	10W x 14H millimetres
Item Shape	Round
Item Weight	0.46 Pounds
Light Color	Multicolored (White, Red, Yellow, Green, Blue, Orange)
Light Output Maximum	300 Lumens
Light Source Wattage	0.25 Watts
Light Type	LED
Manufacturer	EDGELEC
Manufacturer Part Number	ED_DLP03D
Material Type	Metal
Model Number	PW-DIP LED
Number of Items	1
Package Quantity	120
Power Consumption	0.25 Watts
Power Source	Electrical (DC)
Smart Home Compatibility	Not Smart Home Compatible
Special Features	Lightweight
Specific Uses	Decoration
Style Name	5mm Round Lens
Type of Bulb	LED
UPC	611355171996
Voltage	12 Volts (DC)
White Brightness	30 Lumens

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