The submit details a very simple LDR brightness and effectiveness tester circuit establish utilizing an LDR and a digital Ohm meter.
LEDs are not particularly complicated light giving off devices when controlled with DC supplies and the illumination level turns into directly proportional to the current across the LED.
Consequently reading the brightness level under the above situation might not need advanced circuitry as we certainly have in lux meters, rather the reading could be simply received making use of an LDR and a cheap ohm meter.
The set up design of an LED brightness indicator might be observed below:
We observe an LDR enclosed inside a hollow opaque tube. The LED whose brightness ought to be calculated is embedded by means of the opposite hollow end of the tube such that both the devices are introduced face to face inside the tube.
A translucent white material such a roughened acrylic piece could possibly be released between the two device inside the pipe to be able to create the LED light diffuse over the LDR and generate an uniform distribution of light instead of obtaining concentrated over a small inconsistent area of the LDR.
With a DC used across the enclosed LED leads the demonstrated set up would certainly deliver a direct reading in the ohm meter showing the Ohms of the lowered LDR resistance.
This value could be mentioned and compared by other LEDs or a standard good quality LED in hand for getting the needed information regarding their brightness levels and performance.