Light sensor - how to measure strong strobes flash light

Discussion in 'General Electronics Chat' started by omerdoron, Dec 17, 2012.

  1. omerdoron

    Thread Starter New Member

    Dec 17, 2012
    I am using Arduino.
    I need to measure light of 3 strobes (elinchrome d-lite 400)
    I try to use LDR, but it's too sensitive.
    Please help. I don't know I to measure this light.
    each one of the strobes is equal to one second of 400w bulb. and the speed is 1/800 second.
    Thanks in advance.
  2. JDT

    Well-Known Member

    Feb 12, 2009
    The LDR will not have a fast enough response. Better to use a high-speed photodiode. Normally a strobe only produces light for less than a milisecond. Sensitivity can be controlled with an optical filter (like a welding glass).

    Are you trying to measure the peak brightness of the strobe? You will need some kind of sample-and-hold (a capacitor) followed by an A-D converter.