In this article, the author of the YouTube channel Igor Negoda will tell you how he made a powerful LED spotlight.
Materials
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-, diameter 300 mm focal length 120 mm
- Aluminum heatsink from a computer processor
- Batteries
- Polished stainless steel bowl
- Double-sided tape.
Instruments, used by the author.
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Manufacturing process.
So, Igor is not the first time making powerful lights. But now he managed to find a crystal with a power of 300 watts, and having a very small radiating surface. Here, for example, is a comparison of a 100 Watt crystal with it. Such a light flux density should make it possible to obtain a beam with minimal divergence.
As it becomes clear from the data indicated on the package, it needs to be supplied with voltage from 15 to 17 Volts.
The crystal itself comes with a 3 mm thick brass cooling platform. Igor screwed it to an old radiator from a computer processor.
Unfortunately, the laboratory power supply is not suitable for this LED, it has a maximum current of only 5 A.
To do this, he will use a powerful lithium polymer battery. Fully charged, she gives out 17 Volts, but Igor specifically did not fully charge her. This is necessary so as not to burn the LED, and measure the power and voltage drop under load.
So, turning on the LED through the wattmeter, a power of 268 watts was achieved at a voltage of 13.9 V. It shines very brightly!
As a reflector, he will use just such a bowl, acquired in Auchan. The concentrator will be the Fresnel lens.
In the center of the bottom, a rectangular hole was cut for the LED assembly.
Then, using double-sided tape, I glued the module to the bottom.
And tried on a Fresnel lens to the reflector.
Without a Fresnel lens, several rings are visible, and a bright central spot.
But when I installed it, I got a very well-focused spot.
The beam of light has a very slight discrepancy, and this is what you need!
He glued the lens to the side of the bowl, again applying double-sided tape.
And surprisingly, this millimeter of tape thickness only improved focus.
Then he installed a fan, a toggle switch, and secured the battery. With such a large fan power is not enough, but for short-term operation is enough.
Well, it's time to experience! At ranges of about 500 m the lights are just fine. Even with strong background lighting, the spot from the lantern can be seen even at 1,500 m.
And now it turned out to even see the beam reflected from the water on the building.
Thanks to Igor for the idea of a simple but very powerful spotlight!
All good mood, good luck, and interesting ideas!