Why?

[capwizard]

This Hitachi LB55061 I changed LED, when I took pictures show the dark bars but not in my vision? Is something does with LED PWM blinking frequency? How can I calculate it out (camera at 1080p)?

Last pic: Took with no backlight. I dont thing so, because is in the pic..

Is something do with this?

[budm]

Re: Why?

Its your camera shutter speed and PWM.
http://www.tftcentral.co.uk/articles...modulation.htm
http://laptopmedia.com/highlights/wh...o-our-reviews/

[capwizard]

Re: Why?

"We can infer that the phosphor involved in producing blue can switch both on and off faster than the other colours. the backlight will continue to emit light for a few milliseconds after the backlight power is switched off at the end of a duty cycle, "

I saw this phenomenon, I don't think anybody can answer my question, No one will pay attention to it. budm, Thank you. Your correct answer is really surprised me!.............

PS: For 20 minutes I can't find my (T-mobile LG stylo 2 plus) shutter speed, so I use Meter test the frequency of the PWM to LED, found is 20 kHz. 20.000/5 bars = 4000

"Multiply this count by the inverse of the shutter speed. For example, if using a shutter speed of 1/25 of a second and 7 cycles are counted, then the number of cycles per second is 25 * 7 = 175Hz. This is the backlight cycle frequency."

4000 * 5= 20000 =20 kHz ...........So, 1/4000s that is the shutter speed of my phone. ........

[madan1]

Re: Why?

check the metadata of the original photos.. there will find the shutter speed

[capwizard]

Re: Why?

But ...but ...Before you say "Common on, get outta here!"...I have A question?... Why is horizontal bars instead of vertical?

[madan1]

Re: Why?

try tilting the camera.. if the lines stay horizontal, then its because the camera sensor is scanned line by line.
Check here similar effect https://www.youtube.com/watch?v=R-IVw8OKjvQ ( just to note that it's not like the russians have implemented some extraterrestrial technology in their choppers )

[capwizard]

Re: Why?

AH-64 Apache or Mi-24 is better? Why I ask this? I tell you a big military secret, Apache is build over here, Mesa, Arizona.

[Dadiuskilius]

Smd led

Will you please share type/ratings of LED you had success with on the LB55061 strip?

[stj]

Re: Why?

mi24 was better - now discontinued though.
bigger, faster, stronger armor, larger payload.

replaced by 3 seperate models,
when you need something big & heavy that can take fire: MI-35
http://www.russianhelicopters.aero/e...ry/mi-35m.html

small attack: MI-28
http://www.russianhelicopters.aero/e...ry/mi-28n.html

super fast nightmare class :KA-52
http://www.russianhelicopters.aero/e...ary/ka-52.html