Bright LED Christmas Tree Lights

With a stack of 4.5V, LEDs and resistors, you can make all sorts of small bright objects (trees of Christmas, etc). The 4.5V battery powers all of the LED in hours and hours. The LED can be of any color: red, amber, green, blue, white, multicolor…

Mounting of the bright tree led and battery 4.5V

Here’s the diagram including the stack, and each LED-resistance:

Luminous tree with battery 4.5V

Details of the operation of the LED

Each LED needs its resistance connected in series. Do not directly connect a LED on the battery of 4.5V, even at the end of a long wire or a piece of tinfoil that could make resistance. Always a resistance in series with the LED.

The resistance value must always be higher than about 150 Ohms to ensure that the current (intensity) is not too big in the LED. More resistance to a high value, less there is current, less the LED lights up and the battery will last long. You can choose as the value of 220 Ohms resistance.

Calculation of the current:

Current is defined by Ohm’s law for resistors (U = RI)

U: voltage at the terminals of the resistance (in Volts) R: value of the resistance (in Ohms) I: current in the branch

Ohm’s law (the famous “U = RI”) is written here:

R = U/I

What is U, the voltage at the terminals of the resistance?

U = battery voltage (4.5V) – voltage at the terminals of the LED

To avoid grilling a LED, to avoid that the current exceeds its maximum (20mA more often). The worst case is obtained when U voltage at the terminals of the resistance is the largest. The largest possible voltage at the terminals of the battery is 4.8V and the smallest voltage at the terminals of the LED is 1.9V, what makes:

U = 4.8V – 1.9V = 2.9V

For the value of I, we take the maximum current that can pass into the LEDs (20mA = 0.02 A)

R = 2.9V / 0.02 A = 145 ohm

To have a sufficient margin, we take the value 220 Ohms (standard value among the standard)

You can increase the value of the resistance (470 Ohms, 1kOhm, etc) to limit the current and increase the longevity of the battery! On the LED will shine a little less, but the eye does what little the difference.

Feel free to choose 470 Ohm or 1kOhm resistors.

Battery life 4.5V

A new battery of 4.5V is around 3000mAh (order of magnitude failing to find more specific info).

If the tree Christmas has for example 20 LEDs used with 1kOhm resistors, each LED is crossed by a current of 2 to 3mA. The total current (the sum of all currents) is worth about 50 Ma.

The battery life will be of 3000mAh / 50mA = 60 h

The Christmas tree will stay lit non-stop for 60 hours!

Realization of FIR led tips

To plug 4.5V battery, can be used for small crocodile clips

Alligator clip to connect the battery to the LED

First tests with LED, resistance and battery

To start, you can use the battery, resistance and a LED.

Never should the LED is connected to the battery directly. Nothing would limit the current and the LED would FRY for sure (unless the battery is almost empty, but hey… don’t leave this idea here!)

Each branch “LED – résistance” connects in parallel with others.

The long leg of the LED corresponds to the + of the LED.

Bright overall may not exceed 50 to 100 maximum LED to avoid battery does charge too much current, unless you use 1kOhm resistors or more.

The switch can be done with all kinds of metal contacts (Brads, nails and wire, foil, etc.)

B0012ZJRBU

LED color: Classic or multicolor-automatic

Choose the LED color for Christmas tree, everything will work. Some LEDs change color automatically (LED RGB Fast or RGB LED slow for sale on DEALLEDLIGHTS): they contain 3 LED and a miniature electronic circuit that drives the successive 3 LED in LED lighting.

Gallery

Bright White LED Christmas Tree Lights

Bright White LED Christmas Tree Lights

Source: sendmeachristmastree.co.uk

Christmas Xmas Tree Bright LED White/Warm White Lights …

Christmas Xmas Tree Bright LED White/Warm White Lights ...

Source: ebay.co.uk

UK-G Set 50 Indoor Outdoor White Multi Action Battery …

UK-G Set 50 Indoor Outdoor White Multi Action Battery ...

Source: uk-gardens.co.uk

Light Up Silver Glitter Acrylic Snowflake Christmas Tree …

Light Up Silver Glitter Acrylic Snowflake Christmas Tree ...

Source: www.ebay.co.uk

Light Up 1.2m 4ft Bright White Christmas Blossom Tree …

Light Up 1.2m 4ft Bright White Christmas Blossom Tree ...

Source: uk-gardens.co.uk

1000 Treebrights Multi Action Christmas Tree Lights (White)

1000 Treebrights Multi Action Christmas Tree Lights (White)

Source: www.ukchristmasworld.com

80 Multi-Function LED Christmas Tree Lights

80 Multi-Function LED Christmas Tree Lights

Source: www.gmvtrade.co.uk

Led Christmas Tree Lights Too Bright

Led Christmas Tree Lights Too Bright

Source: anthonydeaton.com

50 LED Twinkling Bright White Multi Function Christmas …

50 LED Twinkling Bright White Multi Function Christmas ...

Source: uk-gardens.co.uk

Light Up 45cm Bright White Christmas Blossom Tree …

Light Up 45cm Bright White Christmas Blossom Tree ...

Source: uk-gardens.co.uk

GE LED Holiday Lighting Shines Bright on the National …

GE LED Holiday Lighting Shines Bright on the National ...

Source: pressroom.gelighting.com

Blue Fiber Optic Lamp Light Bright LED Christmas Tree …

Blue Fiber Optic Lamp Light Bright LED Christmas Tree ...

Source: www.ebay.co.uk

Battery 20 Bright LED Micro String Lights Christmas Tree …

Battery 20 Bright LED Micro String Lights Christmas Tree ...

Source: www.ebay.co.uk

Battery 20 Bright LED Micro String Lights Christmas Tree …

Battery 20 Bright LED Micro String Lights Christmas Tree ...

Source: www.ebay.co.uk

Bright outdoor christmas lights

Bright outdoor christmas lights

Source: www.pricechaser.co.uk

400 Bright White Christmas Tree Fairy Lights Multi Action …

400 Bright White Christmas Tree Fairy Lights Multi Action ...

Source: uk-gardens.co.uk

Battery 20 Bright LED Micro String Lights Christmas Tree …

Battery 20 Bright LED Micro String Lights Christmas Tree ...

Source: www.ebay.co.uk

Christmas Xmas Bright LED Snowing Icicle Lights Indoor …

Christmas Xmas Bright LED Snowing Icicle Lights Indoor ...

Source: www.ebay.co.uk

480 Bright LED String Christmas Light Static Xmas Tree …

480 Bright LED String Christmas Light Static Xmas Tree ...

Source: www.ebay.co.uk

BRIGHT ZEAL Wooden Christmas Tree with LED Lights (14.5 …

BRIGHT ZEAL Wooden Christmas Tree with LED Lights (14.5 ...

Source: www.wantitall.co.za