LED Search Light

LED search lights are very common today and the technology behind it gone too far. China produces LED devices massively in different size and shapes. One day I got a reflector and along with an LED of a Chinese torch. The reflector was in good condition and the LED was moderately bright. I was in very need of a search light at that time. So I decided to make one.

The idea was clear; build a housing for the reflector and to hold the switch, battery and charging port. I first tried to use old lights which had incandescent bulbs. But they were not good. Then I decided to use a PVC pipe and two reducer joints like the diagram shows. The big reducer at the head of the PVC is used to hold the reflector. The reflector is held in position using four small screws. I made a rectangular hole on the PVC to hold the switch. At the tail end, a power jack is fixed for charging. 


https://drive.google.com/uc?id=0B_FuMGaqECLuTkJkNUJIU2xDQjg&export=view

https://drive.google.com/uc?id=0B_FuMGaqECLuWDY4LWNrWFB1cVE&export=view


I used three Ni-CD batteries which would give 1.2 * 3 = 3.6V, enough for the LED to light up. A dummy battery is used to tightly fit the batteries inside the pipe. The charging circuit is simple and you should turn off the LED before charging. Use a +5V regulated supply, may be with current limiting for charging. You can use the third pin of the jack to disconnect the light from the battery while charging, to protect it.

I didn't use any oscillator circuit for driving the LED. You can add one if you want and it will give you some brightness and may some power.  The batteries I used had 1200 mAh current capacity. The batteries of most of the China lights die after some use. So don't throw the light away, like someone did and that's why I got one; make yourself one. It is cheap and simple.


LED Search Light
LED Search Light














LED Search Light
LED Search Light














LED Search Light
LED Search Light














LED Search Light

LED Search Light














LED Search Light


Time-stamp

Date Published : 12:56 AM 2-12-2014-Tuesday
Last Updated : 9:45 PM 29-03-2016, Tuesday

Downloads

The following are all files associated with this project including all images, high resolution diagrams both in JPEG and PDF formats.


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  Dec 1, 2014, 11:29 AM Vishnu M Aiea
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  Dec 1, 2014, 11:29 AM Vishnu M Aiea
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  Dec 1, 2014, 11:29 AM Vishnu M Aiea
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  Dec 1, 2014, 11:29 AM Vishnu M Aiea