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Intro:

A follower of mine on Instructables wanted to build a LED light to be used in Photography and wanted my help,

so I took up the challenge and built this LED SUN GUN  which runs on AC. 

It is cheap in comparison to the ones sold in the market and as it runs on AC there is no battery problems.

Step 1: Parts You Will Need…..

Sixty- Extra bright, white 8mm LED’s

One- AC transformer 220volts to 12volts of 2Amps.

Four- 1N4007 Diodes for bridge rectifier.

One- Condenser 470uF anything from 25 to 65 volts will do.

One- ON OFF switch.

Wires, solder, wall plug, tools etc;

Step 2: Old Sungun….

I had an old Sun gun (halogen tube type) in my junk with a fused tube.

I opened up the casing and threw away all the parts inside it.

Next I took a PVC sheet and cut it to the required size to be used as a base for my LED’s.

Step 3: The Circuit…

60 number of Extra Bright 8mm White LED’s are used in this Sun Gun.

The LED series/parallel 6 x 10 array uses 60 LED's exactly.

This circuit uses 10 parallel rows of 6 LED’s in series as shown in the Diagram.

Follow the Circuit and make the LED arrays.

The calculation:-

Transformer output without load is 14.4 x 1.4 = 20.16

20.16 / 3.5 = 5.76 or 6 LED’s in a single row.

8mm LED’s 3.5 volts consumes 30mA current.

The transformer puts out 2A = 2000mA.

Each row consumes 30mA, so you can put 2000/30 or 66.6 rows,

but round DOWN to get a maximum of 66 rows.

OR 66 x 6 = Total 396 LED’s.

 

For 3 panels of 10 rows each, the total comes to 30 rows: with each row consuming 0.30 amps (30mA), 30 *

0.3 = 0.9amp, which the SINGLE 1N400x bridge can handle fine. It’s ONLY when you have more than 30

rows that you need worry about the Double Rectifier.

 

Step 4: The Power Supply…

A 220VAC to 12 VAC Transformer of 2Amps is screwed on to the handle of the Sun Gun with its own PVC housing.

A Bridge Rectifier of Four 1N4007 Diodes and a Condenser of 470uF / 35 volts is used to convert AC to DC.

So you get 2 Amps of Direct Current to run the LED’s which is more then enough.

A 2 Amps Transformer is used because if the light is inadequate then you can add

two more Panels of 60 LED’s on both sides of the Sun Gun,

so the total numbers 60x3=180 LED’s of light will be more than enough.

Step 5: Transformation.....


Here you can see how an old, power consuming Sun Gun has been converted to a Powerful LED Light, suitable for Photography..

SWITCH ON AND ENJOY...............
<p>Dipankar </p><p>Any way to dim the lights ?</p><p>regards</p>
<p>You can try and put a electronic fan regulator in place of the switch, which has a capability to work up to 5 Amps.</p>
But r they PWM devices ? otherwise normal dimmers cause flicker..have u tried it ?
<p>I said you can try, I have not tried it.....</p><p>The other way is to divide the 10 rows to 5+5 and put a single pole double throw switch (SPDT) .</p>
this wont work
<p><strong>For 3 panels of 10 rows each, the total comes to 30 <br>rows: with each row consuming 0.30 amps (30mA), 30 * 0.3 = 0.9amp, which the <br>SINGLE 1N400x bridge can handle fine. It&rsquo;s ONLY when you have more than 30 rows <br>that you need worry about the Double Rectifier.</strong></p>
30mA=0.03A
<p>This wont work... the electronics as well as the theory.</p>
<p>It is working well...........</p><p><strong>For 3 panels of 10 rows each, the total comes to 30 <br>rows: with each row consuming 0.30 amps (30mA), 30 * 0.3 = 0.9amp, which the <br>SINGLE 1N400x bridge can handle fine. It&rsquo;s ONLY when you have more than 30 rows <br>that you need worry about the Double Rectifier.</strong></p>
<p>It is working fine......</p>
Are the positive and negative wires interchanged?
<p>Yes , Sorry for the mistake..........</p>
<p>What changes should I make if I want to connect LEDs in series instead of parallel?</p>
<p>Series and parallel are both required to distribute the load of the Transformer.</p>
Great thank you. I think I will be making it the same way you have mentioned Will tell you how it goes. Thank you
<p>Sorry folks, there was some confusion in the Power supply which now has <br>been rectified.........Thank you all for pointing it out....</p>
<p>Sorry folks, there was some confusion in the Power supply which now has been rectified.........Thank you all for pointing it out....</p>
<p>Did you actually try and build this? Your power supply will only generate 17 volts and you would need 21.7 volts for any current to flow through the diodes. If you did build a supply with a high enough voltage, you would need some way of limiting the current flowing through the LEDs. A two amp supply split through ten LED branches will draw 200 milliamps per branch. If your LEDs are rated for only 30 milliamps, you will smoke them all with that much current.</p>
<p>See the calculation.....It is working fine.... Try it out and see for yourself....</p>
<p>Hi, thanks for the very informative article, I'm already looking at this circuit. And here's the circuit I'm really excited. So thank you very much.</p>
I have to agree with Krinkov. This won't work.
the 8mm strawhat LED is not longlasting LED in my experience..
Brilliant !!
<p>:D thank you</p>
<p>5***** !</p>

About This Instructable

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Bio: Now I am a retired person, who enjoys life and making small things to pass the time keep myself busy.
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