LED avrerage power

[radel]

Hi everyone,

I am using LED Vf=3v and If=700mA. This LEDs used some light array project as flashing leds simultanously.

i will turn on 15 LEDs at a time. 5x3 (5rows and 3 coloum) matrix.

Duty cycle is 667ms

ON time=165mS
OFF time=502mS


LES are 2W rated .


please help to find Average power of LED.
 
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[tron9000]

your duty cycle isn't 667ms, that's your freqency, from your on & off times your duty cycle is:
165ms / 667ms = 0.25 or 25%

P = IV; so considering you LED is on for 1/4 of the time...your power should be....

(i'm not giving you the answer...I want to know if you can figure it out, least then I know what level your at)

[alsetalokin4017]

Since we are being pedantic....

667 ms isn't a frequency, it's a period. The units of frequency aren't seconds, they are cycles per second, ie Hz. Frequency is 1/period (and period = 1/frequency) so the frequency is.....

(left as an exercise for the reader...)

[tron9000]

true yes, incorrect terminology on my part, apologies (In my head I see period and get frequency), but something that the OP could figure out.

Hardly being pedantic - there's a difference between knowing the answer and being shown how to get the answer. One's transferable knowledge, the others just reciting.