It’s caused by the shutter speed of the camera changing as the light changes. If you put on an ND filter it will fix that
@mwjones71
28 күн бұрын
LED's by their nature are DC only devices. If you were feeding raw AC into an LED, it would flicker in sync with the AC frequency (which is why you sometimes see epilepsy warnings, because that flickering can trigger a seizure). It is likely in the bungalow that there is a AC to DC rectifier as part of the power supply. This will produce a rough DC power, enough for the lights to not flicker, but will still suffer from fade in fade out since it is not a clean DC power. Typically one or more capacitors is inserted in the power supply circuit to smooth out the ripples, which results in clean DC power. We do not see it with the naked eye, because of the way the eye and brain work to "fill in the gaps" - a camera on the other hand, especially one working at 30 or 60 frames per seconds will pick up on it (especially since the utility power in the United States is at 60 hertz - or 60 cycles per second) Based on your demonstration, that is what is happening. Switching to the DC batteries gives it clean DC power, and thus the problem goes away.
@RailroadSignsandSignals
28 күн бұрын
This still doesn’t answer the question, why they don’t fade at night on ac. I came to the same conclusion that you did, given how LEDs work on AC circuits different than DC and most cameras record 30 or 60 FPS but if it was FPS and Hz matching alone, it would do the same at night.
@mwjones71
28 күн бұрын
@@RailroadSignsandSignals Because the camera has to keep the shutter open longer per exposure at night to compensate for lower light levels, longer exposure = more bright light flooding the sensor, thus the fades are not as obvious. You can see that in your video, in the night shots, the LED's appear to move up and down when they are on vs. off, this is the artifacts of the longer exposure times. It's also why video or pictures of fireworks at night are so much more exciting that in person, the camera can take in much more light in each exposure creating those stunning shots.
@ScottsRailroadVideos
27 күн бұрын
Basicly the correct answer. @@mwjones71
@csxtrainfan319
23 күн бұрын
I see this a lot on sunny days And it usually has to do with our cameras.
@oliverandthemorrisons9667
28 күн бұрын
Cameras do that on GE dotted leds too, but they flicker instead of fading, it might have to do something with the refresh rate on the Cameras
@RailroadSignsandSignals
28 күн бұрын
Problem is, if it was the frame rate of the camera alone, it would do the same at night. The fact it does not do this on DC power but AC power only and during the day makes it difficult to pinpoint what the culprit actually is.
@Catnap20011
19 күн бұрын
The lights when you get closer you cannot see them and if you go more far away you can see them and they are malfunctioning
@ThePrairiesRailfan
28 күн бұрын
I’ve seen these on CSX to where crossing lights fade in and out, I’ve been interested why that happens
@pineappleroad
28 күн бұрын
Do the lights take AC directly, or does it get converted to DC first in the controller cabinet? I suspect it could be partially due to unsmoothed AC to DC conversion, and the fact that the grid frequency not exactly 60hz It could also have something to do with the cameras shutter speed (some cameras can change their shutter speed to match other frequencies while still recording at a user selected frame rate), the camera could even be attempting to match its shutter speed with the lights automatically but failing at it (I don’t know how likely this is) Funnily enough crossing lights in the country where i live don’t seem to have this issue for whatever reason (but you probably wouldn’t want to try and get hold of any, as they would look out of place, not to mention they might not fit)
@RailroadSignsandSignals
28 күн бұрын
The lights take 60 Hz AC (16 volts) and when on battery backup it is 8-9 volts DC. If you are out of the United States and where 50 Hz AC is used then that would possibly explain why you see them just fine there. Another problem is if they run on DC instead of AC.
@100killstreakOg
27 күн бұрын
Those led lights are used for new signals but could be a problem or just part of the led
@Im_notNachoman21
28 күн бұрын
This all likely happens because the light frequency that the light insert emits is different from the frame rate of the camera. Every time a frame is recorded, depending on the light frequency, it could either land on a time where the light is off or on. Because the framerate is inaccurate to the light frequency, every frame recorded will slightly offset the timings. Meaning eventually, you will land on a point where the light appears to be off.
@RailroadSignsandSignals
28 күн бұрын
One problem with that, why doesn’t it fade out at night on AC power?
@Im_notNachoman21
28 күн бұрын
@@RailroadSignsandSignals because the direction AC flows is diffferent. DC flows in a single direction while AC doesn’t. So it could per chance change the light frequency without changing the brightness
@Catnap20011
19 күн бұрын
The light can get broken
@Indianarailproductions
27 күн бұрын
You can run crossing LED’s on AC? I didn’t know that.
@RailroadSignsandSignals
27 күн бұрын
Almost all crossing lights run on AC. Dc is almost always for battery backup only.
@Indianarailproductions
27 күн бұрын
@@RailroadSignsandSignalswell, thanks for telling me! I figured it would hurt it in some way
@RailroadSignsandSignals
27 күн бұрын
Just remember, it is 10-16 volts AC and not 110 volts ac like LED traffic light modules.
@STHSIndustries2K6
28 күн бұрын
The lights having some issues. It's unclear what's going on
@SamuelElevatorFan
28 күн бұрын
Unexplained The LED Lights Look Like Messed Up Like Fading
Пікірлер: 25