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LED Brightness and Efficiency Tester Circuit

Last Updated on March 13, 2019 by Swagatam 4 Comments

In this post I have explained a simple LDR brightness and efficiency tester circuit set up using an LDR and a digital Ohm meter. The idea was requested by Mr. Prashant

Table of Contents
  • Technical Specifications
  • The Design
  • Circuit Diagram

Technical Specifications

I want to check brightness and light of 1 watt led.
Can i check it with help of ldr. Bekoz luminous sensor cost is too high.
How can i measure which led has  bright light if i have three quality type 1 watt led.
Plz solve the prob.
Thank you
Prashant sharma

The Design

LEDs are not very complex light emitting devices when operated with DC supplies and the illumination level becomes directly proportional to the current across the LED.

Therefore reading the brightness level under the above condition may not require sophisticated circuitry as we have in lux meters, instead the reading can be simply obtained using an LDR and a cheap ohm meter.

The set up design of an LED brightness indicator may be witnessed below:

We see an LDR enclosed inside a hollow opaque tube. The LED whose brightness is required to be measured is inserted through the opposite hollow end of the tube such that both the devices are brought face to face inside the tube.

A translucent white material such a roughened acrylic piece could be introduced between the two device inside the pipe in order to make the LED light diffuse over the LDR and produce an uniform distribution of light instead of getting focused over a small inconsistent area of the LDR.

With a DC applied across the enclosed LED leads the shown set up would produce a direct reading in the ohm meter indicating the Ohms of the lowered LDR resistance. This value may be noted and compared by other LEDs or a standard good quality LED in hand for getting the required information regarding their brightness levels and efficiency.

Circuit Diagram

warning message: electricity is dangerous, proceed with caution
ledbrightnessindicator 1

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Filed Under: Meters and Testers Tagged With: Brightness, Efficiency, LED, Tester

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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Reader Interactions

Comments

  1. basit momin says

    March 7, 2016 at 5:34 pm

    value of LDR for checking led brigntness ….and sir can we get the led wattage by calculating the number displayed in ohm meter is their any formula for that

    Reply
    • Swagatam says

      March 8, 2016 at 3:53 am

      you can use any standard LDR and calibrate the meter reading by illuminating the LDR with an LED whose values are known, and then by referring to this reading on the meter you can calibrate the full sale of the meter proportionately.

      Reply
  2. basit momin says

    March 6, 2016 at 7:52 pm

    Hello sir ………what should be the value of LDR

    Reply
    • Swagatam says

      March 7, 2016 at 9:03 am

      Hello Basit, value of LDR for which circuit?

      Reply

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