I am new to electronics, please can you tell me what is the data sheet max current for each colour is, so i can work out resistance. Many thanks.

sorry cant help I returned Item

can these bulbs be dimmed?

Hello! Brightness can't be adjusted!

How many leds can I run from a single 12v 1A power supply?

These are bright LEDs and only require about 10mA to give a decent glow. You cannot connect an LED directly to a 12v power supply as it will burn out. Depending on the LED colour, each colour type will exhibit a different volt drop. Red is about 1.2v, green will be higher because of the doping required in the semiconductor PN junction. So connecting a 12v power supply will require a resistor in series with the LED. You need to calculate what resistor value and wattage is required in series with the LED based on a 12v supply. You use Ohms Law to do this. LEDs are never connected in series as the volt drop reduces from one LED to the next and each LED down the line will be dimmer than the one before it. So you need to connect them in parallel. This becomes more complicated to calculate taking into account different LEDs colours have a differerend volt drop as mentioned above. If they are all the same colour, say red, you know the volt drop for each one and you can calculate the required resistor value and wattage.

Do these have a built in resistor current limiting resistor?

There are two different voltage ratings so you would need a suitable resistor for each. Check which one and look on line to see how to work out the right value for the voltage you are using.

Cesfonjer 500pcs X 5mm Light Emitting Diode Diffused 2pin Round

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¥5504

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Description

✨ Light up your ideas with every color in the spectrum! 🎨

COLORFUL VERSATILITY - Five distinct colors—Red, Green, Yellow, Blue, White—perfect for any creative project
DURABLE ECO FRIENDLY - High-quality, energy-saving LEDs built to last through countless projects
ORGANIZED READY TO USE - Neatly labeled kit box keeps all 500 LEDs sorted and easy to access
ENDLESS DIY POSSIBILITIES - Ideal for electronics, car decor, school experiments, and innovative lighting designs
PRECISION BRIGHTNESS CONTROL - Optimized 20mA current for consistent, vivid illumination

The CESFONJER 500pcs 5mm LED kit offers a comprehensive set of diffused, round LEDs in five vibrant colors, each with a 20mA working current and durable design. Packaged in a convenient, labeled storage box, this energy-efficient kit is perfect for professionals and hobbyists seeking reliable, versatile lighting solutions for DIY electronics, educational projects, and creative decor.

Reviews

C**R

A nice LED stock box for development projects

A great little addition to any DIYer's stock for development projects.

21.01.2025

S**S

SCS

An amazing kit, well presented. Delivery Excellent

21.01.2025

B**R

LED's

Good choice of colours, nice and bright, good price for the amount you get. If you are looking for good value LED's then I recommend these.

2.12.2023

R**N

done for me

dose what it does

16.03.2025

P**'

This item is perfect for use when trying to get some colour

I'm using them to write people's name in lights

27.10.2024

O**R

Nice kit

These leds are great. They shine really bright and the variety of different coloursmakes for fun projects. There is more than enough for anything i might want to makewith this. The compartmented box makes it easy to select any colour i want. And it wasworth the £10 i spent. It arrived within a week which is good.

16.07.2020

M**.

excellent value

plenty to play with.

16.02.2024

B**M

Really good actually

It was worth the money but some of them did come twisted and they weren't recoverable

13.02.2023

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

¥5504

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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Manufacturer	CESFONJER
Part number	J054
Item Weight	170 g
Product Dimensions	18 x 11 x 2 cm; 170 g
Item model number	ERD29-087
Size	5mm/500pcs
Colour	LED Diodes 5mm (500PCS)
Shape	Round
Wattage	1 KW
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

CESFONJER 500pcs x 5mm Light Emitting Diode, Diffused 2pin Round Color White/Red/Yellow/Green/Blue Kit Box (5 colors x 100pcs)

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