Can you tell the difference between a 50hz and 60hz flash patterns on video? « on: October 16, 2020, 12:48:22 PM » Author: WorldwideHIDCollectorUSA
I wonder if anybody who has experience watching lighting videos can see the difference between 50hz and 60hz flash patterns.
		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #2 on: October 23, 2020, 12:59:56 AM » Author: WorldwideHIDCollectorUSA
In my experience, 60hz flicker on video appears as stationary dark bands while 50hz flicker on video shows fleeting dark bands.
		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #3 on: October 23, 2020, 03:09:37 AM » Author: Medved
If you know your frame frequency, it hasn't been altered by any conversions, the strobe pattern should tell it. But very often the camera sensor does not operate at the same frame rate as it is then stored in the file, so it becomes hard to tell then, all the compression and conversions make a ton of artifacts, which then drown the effects you are looking for.
		Logged

No more selfballasted c***

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #4 on: October 23, 2020, 03:37:11 AM » Author: WorldwideHIDCollectorUSA
The slow moving and stationary dark bands is indicative of a 60hz flash pattern from my observation while fleeting dark bands indicate a 50hz flash pattern. This is what I have observed when watching lighting videos that were filmed in various parts of the world.
		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #5 on: October 23, 2020, 03:37:28 AM » Author: dor123
Most digital cameras, capture videos at 30FPS and 60FPS, even if their video system is set to PAL and not NTSC. But there are some video cameras that can see 25FPS and 50FPS, there the 100hz and 50hz flickering would be stationary lines and not moving lines
« Last Edit: October 23, 2020, 03:49:18 AM by dor123 »		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #6 on: October 23, 2020, 03:46:22 AM » Author: WorldwideHIDCollectorUSA
Here is a lighting video filmed with 60hz flicker: https://youtu.be/oDCe4en5sVg Here is a lighting video filmed with 50hz flicker: https://youtu.be/OWeqxFCnJ2A These flash patterns are what I commonly see on youtube.
		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #7 on: October 23, 2020, 03:55:54 AM » Author: dor123
Both videos are captured at 60FPS, hence the moving lines at the 50hz videos. If "The -Y&Z-" would have a video camera that can capture 50FPS, the lines would be the same as in the 60hz video, not moving. This is all related to the matching between the flickering frequency and the camera frames per second shooting. so the lines won't move if 50hz or 100hz are captured by 25FPS or 50FPS, and 60hz or 120hz by 30FPS or 60FPS, but will move if 50hz captured by 30FPS and 60FPS and 60FPS by 25FPS and 50FPS. Here is a 50hz video that was captured at 50FPS: https://www.youtube.com/watch?v=sPzhW1LpTqM
« Last Edit: October 23, 2020, 03:58:13 AM by dor123 »		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #8 on: October 23, 2020, 04:08:52 AM » Author: WorldwideHIDCollectorUSA
Quote from: dor123 on October 23, 2020, 03:55:54 AM Both videos are captured at 60FPS, hence the moving lines at the 50hz videos. If "The -Y&Z-" would have a video camera that can capture 50FPS, the lines would be the same as in the 60hz video, not moving. This is all related to the matching between the flickering frequency and the camera frames per second shooting. so the lines won't move if 50hz or 100hz are captured by 25FPS or 50FPS, and 60hz or 120hz by 30FPS or 60FPS, but will move if 50hz captured by 30FPS and 60FPS and 60FPS by 25FPS and 50FPS. Here is a 50hz video that was captured at 50FPS: https://www.youtube.com/watch?v=sPzhW1LpTqM I can tell that the video is 50hz due to the sound of the ballast hum. Do you know of any 60hz videos filmed at 50FPS?
		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #9 on: October 23, 2020, 04:14:50 AM » Author: dor123
I don't know about videos of 50/100hz lighting that being captured at 30/60FPS.
		Logged

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Can you tell the difference between a 50hz and 60hz flash patterns on video? « Reply #10 on: October 23, 2020, 07:14:34 AM » Author: Medved
Quote from: dor123 on October 23, 2020, 04:14:50 AM I don't know about videos of 50/100hz lighting that being captured at 30/60FPS. Most monitor interfaces are based on the 60Hz, so are many camera ones. But these effects are known and generally treated as an evil, so many systems use measures to specifically suppress them (physical camera frame rate, combined with the postprocessing software). And these often works to eliminate the effects, but sometimes create a plethora of new ones. And because these systems use to be designed to work with both 50 and 60Hz, they may easily smear the difference (e.g. use the physical camera frame rate at 55Hz and suppress the 5Hz beat frequency in the software), or make the resulting effects (the 5Hz) the same for both 50 and 60Hz flicker.
		Logged

No more selfballasted c***