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Garinei Afula Hahamania, replaced their 8 400W MH floodlights to 200W SMD LED floodlights, and operating them 24/7

Garinei Afula Hahamania, replaced their 8 400W MH floodlights to 200W SMD LED floodlights, and operating them 24/7

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And they already have parts of the LEDs dimmed:

They have 4 on the roof, and 4 at the entrance (Not visible here).

IMG_3904.JPG IMG_3891.JPG IMG_3888.JPG IMG_3886.JPG

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Filename:IMG_3888.JPG
Album name:dor123 / LED lighting (Except road lanterns), LEDs in general, lasers, flashlights and other lighting gadgets
Keywords:Lanterns
File Size:554 KB
Date added:Sep 07, 2017
Dimensions:1600 x 1200 pixels
Displayed:50 times
Date Time:2017:09:06 17:50:23
DateTime Original:2017:09:06 17:50:23
Exposure Bias:0 EV
Exposure Time:1/400 sec
FNumber:f 3.4
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Focal length:5 mm
ISO:160
Make:Canon
Model:Canon PowerShot SX150 IS
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merc
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Adam


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Sep 07, 2017 at 12:48 PM Author: merc
I wonder if these are really dimmed or it's just the short exposure time?

This LED block exhibited the same phenomenon while photographed with a very short exposure time. It was lit uniformly with slower shutter speeds though.
There may be multiple LED drivers, alternating in powering segments of the SMD array.
If you can, try to photograph it like with 1/25s, or make more shots to check, if the dimmed segments are always the same.

Not a misoLEDist...

dor123
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Sep 08, 2017 at 12:49 AM Author: dor123
The dimmed segements are always the same. Through the camera screen, all of them flickered a uniform 100hz or similar, and remained at the same brightness, and didn't looked like this .

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Sep 08, 2017 at 01:07 AM Author: Beta 5
Did they operate the 400w MH 24/7 too?
If they didn't then they are saving no energy, as the LED is using half the power but being on all the time cancels out any energy saving.
It always annoys me when people down grade to LED, and then leave them on during the day or 24/7, so not saving any energy at all.

Thorn Beta 5 35W SOX 1965 - 2008. Top entry/Side entry

dor123
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Sep 08, 2017 at 01:29 AM Author: dor123
I think they began to do this, when they still had the 400W MH floodlights.
They could simply reduces the number of floodlights and operating them only at the evening, and turning off them when closing.
More and more business in Israel, dayburning their lighting 24/7.

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

merc
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Sep 08, 2017 at 02:14 AM Author: merc
The lights turned on may say to customers: "We are open". The revenue taken from customers easily covers electricity bills.
But I agree with Beta 5 - it annoys me too.

Not a misoLEDist...

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Sep 08, 2017 at 02:17 AM Author: Ash
I visited Dor on that day, the floodlights were in front of the place where we met. The brightness difference is visible by naked eye



The drivers in this style of LED floodlights is embedded in the panel. The LED arrangement is very much like in a LED filament, the array have ~150V forward voltage and its supply is not isolated from the line power (in contrast to the COB designs). This floodlight apparently have 4 sections each with its own driver, and with 100 LEDs in a section, they are probably in 2P50S setup

Some fault in the driver makes them underdrive (or overdrive ?) the array
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