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A T8 LED tube in the parking lot of the Cinemall mall, with parts of the LED dimmed

A T8 LED tube in the parking lot of the Cinemall mall, with parts of the LED dimmed

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All of the LED tubes, exhibits this problem.
Picture is severally underexposed (See EXIF information), in order to see the brightness differences.

IMG_0183~0.JPG IMG_0170.jpg IMG_0166.JPG IMG_0146~1.JPG

File information

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Download: Download this File
Filename:IMG_0166.JPG
Album name:dor123 / LED lighting (Except road lanterns), LEDs in general, lasers, flashlights and other lighting gadgets
Keywords:Lamps
File Size:209 KB
Date added:Jan 24, 2013
Dimensions:1600 x 1200 pixels
Displayed:228 times
Date Time:2013:01:24 19:46:45
DateTime Original:2013:01:24 19:46:45
Exposure Bias:0 EV
Exposure Time:1/1000 sec
FNumber:f 8
Flash:No Flash
Focal length:5 mm
ISO:400
Make:Canon
Model:Canon PowerShot SX150 IS
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-75395
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marcopete87
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Jan 24, 2013 at 03:51 PM Author: marcopete87
does is it an problem, or is an feature?
remember about programmers: an bug can be an useless feature
Ash
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Jan 24, 2013 at 04:13 PM Author: Ash
Not far from here there is a LED floodlight htat was installed i think in 2008-2010. It was nice and bright but after a day with very bad weather it became like this too - 1/2 of the leds light normal, 1/2 dim (and sometimes a bit dimmer or brighter - not stable from nihgtto night) -i think water damage inside

Maybe hte same here - mouisture on the circuit board ?

If not - maybe just the LEDs degraded and some runaway effect caused the different groups to degrade to different extent ?

And maybe some capacitor in the driver
dor123
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Jan 24, 2013 at 04:13 PM Author: dor123
This is a problem. All of the LEDs, should have about the same brightness. If parts of the LEDs dimmed, this means LED overheating.

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.

Medved
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Jan 24, 2013 at 05:03 PM Author: Medved
As it happened after a day with bad weather, I would guess for water damage. Note, it is about complete sections going dimmer or brighter, if the LED's would degrade such quickly and unevenly, it would not form such uniform sections.
So my guess is the electronic inside got damaged somehow...

No more selfballasted c***

Kev
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Jan 24, 2013 at 05:40 PM Author: Kev
My engineering solution to this problem.... Remove LED tube place in WEEE bin and install Philips master 840 in place with Philips S10 starter.
LED flood, remove also place in appropriate skip / trash and replaced with HID flood light ideally SON or MERCURY VAPOUR! Problems fixed for a long time!

Voted to leave the EU and proud! 👉🏻🇪🇺🇬🇧

dor123
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Jan 25, 2013 at 02:00 AM Author: dor123
Kev: Isn't the former Osram L 36W/765 were better? Most triphosphors T8 lamps are low mercury lamps, meaning that they have shorter life and colour changes during lamp life (Three seperate RGB phosphors).
Btw, when I today went to Mega Bull supermarket at the city center of Kiryat Ata, I passed near a shop, that was during opening, and they had several HID highbays, with high wattage T2 helical CFLs instead. Despite not MH lamps, the lamps looked exactly like an HID lamp during warm-up when turned on: Dimmer and brighter parts in them. So where is the adventage of the instant full brightness of fluorescent over MH?

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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