Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > General Electronics Technical Discussion
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 04-08-2021, 03:59 AM   #1
dicky96
Sun Seeker
 
dicky96's Avatar
 
Join Date: Mar 2017
City & State: Sunny Gran Canaria
My Country: Spain
Line Voltage: 220V 50Hz
I'm a: Professional Tech
Posts: 1,375
Default Can someone identify this LED type?

Hi guys
I need some replacement Red LEDs for an advertising sign.

I thought the original ones were 5mm but they are not, I could only fit a 5mm if I pushed a round file through the hole and widened it slightly. The originals mus be about 4.5mm. Also the original type are shorter, and the 5mm type does not look right when fitted - I tried one.

I thought these were called 'Bowler Hat' LEDs. but when I searched for that on aliexpress, it is clearly not what they are!

https://www.aliexpress.com/af/bowler...20210408015120

See pics, it's the shorter type I need.
Cheers
Attached Images
File Type: jpg IMG_20210408_102824.jpg (555.2 KB, 26 views)
File Type: jpg IMG_20210408_102836.jpg (491.4 KB, 25 views)
dicky96 is offline   Reply With Quote
Old 04-08-2021, 04:41 AM   #2
diif
Badcaps Veteran
 
Join Date: Feb 2014
City & State: Midlands
My Country: England
I'm a: Professional Tech
Posts: 6,034
Default Re: Can someone identify this LED type?

Search for straw hat LED not bowler hat.

The search engine used by Ali is garbage, but then they can't even save currency and language settings so it's not surprising

https://www.pcboard.ca/straw-hat-led-red

There seem to be plenty of 4.8mm sized red LEDs on Ali https://www.aliexpress.com/wholesale...+straw+hat+red

Last edited by diif; 04-08-2021 at 04:48 AM..
diif is offline   Reply With Quote
Old 04-08-2021, 05:02 AM   #3
dicky96
Sun Seeker
 
dicky96's Avatar
 
Join Date: Mar 2017
City & State: Sunny Gran Canaria
My Country: Spain
Line Voltage: 220V 50Hz
I'm a: Professional Tech
Posts: 1,375
Default Re: Can someone identify this LED type?

Straw hat they are. Thanks diif
dicky96 is offline   Reply With Quote
Old 04-08-2021, 09:18 AM   #4
eccerr0r
Solder Sloth
 
eccerr0r's Avatar
 
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,163
Default Re: Can someone identify this LED type?

damn, whoever invented the name for those should be shot...
eccerr0r is offline   Reply With Quote
Old 04-08-2021, 10:29 AM   #5
sam_sam_sam
Badcaps Veteran
 
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
My Country: USA
Line Voltage: 120 Volts 60 HZ
I'm a: Knowledge Seeker
Posts: 3,559
Default Re: Can someone identify this LED type?

I have not seen the shorter one before
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
sam_sam_sam is offline   Reply With Quote
Old 04-08-2021, 11:04 AM   #6
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,538
Default Re: Can someone identify this LED type?

The height of the LED die in the epoxy lens determines its viewing angle. For wide angle, the straw hat's have not much for a lens, almost flat tops, compared to usual T1-3/4 (5mm) parts. You have to look at the side of the LED to figure out if it's narrow or wide angle.

Also, the brightness intensity in candelas is much lower number for wide angle LED's because the light is over a wider area. Shopping the brightest LED's, a 20 LED is much higher cd number than the same die in a wide angle lens package.

LED signs I always recap the power supply, so many bad electrolytics which can be part of the problem.
redwire is offline   Reply With Quote
Old 04-08-2021, 11:10 AM   #7
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,675
Default Re: Can someone identify this LED type?

last sign i fixed had a leaking nicad in it!!
stj is offline   Reply With Quote
Old 04-08-2021, 03:15 PM   #8
dicky96
Sun Seeker
 
dicky96's Avatar
 
Join Date: Mar 2017
City & State: Sunny Gran Canaria
My Country: Spain
Line Voltage: 220V 50Hz
I'm a: Professional Tech
Posts: 1,375
Default Re: Can someone identify this LED type?

The only problem I have now is all the 'Worzel Gummidge' LEDs (google it if you don't get the joke!) on the sign are made of red plastic, where as all the cheap ones I can find on ali or ebay are clear plastic and probably would not look right unless I replaced all of them - so I can't see any cheap enough option to make it worthwhile fixing.

Last edited by dicky96; 04-08-2021 at 03:18 PM..
dicky96 is offline   Reply With Quote
Old 04-08-2021, 03:36 PM   #9
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,538
Default Re: Can someone identify this LED type?

search "diffused straw hat" should find ones with tinted/diffused package.
Lots on Aliexpress too.
redwire is offline   Reply With Quote
Old 04-08-2021, 06:43 PM   #10
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,675
Default Re: Can someone identify this LED type?

you may need to replace them all anyway - chances of them having the same brightness is slim.
stj is offline   Reply With Quote
Old 04-08-2021, 08:22 PM   #11
eccerr0r
Solder Sloth
 
eccerr0r's Avatar
 
Join Date: Nov 2012
City & State: CO
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Hobbyist Tech
Posts: 7,163
Default Re: Can someone identify this LED type?

Could cheat and change resistors ... granted if it were wired by letter it'd make it less likely to notice intensity differences.
eccerr0r is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 01:44 AM.
Did you find this forum helpful?