From: RussellMc <apptechnz@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
CC: ApptechNZ <apptechnz@gmail.com>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Mon, 3 Aug 2020 17:00:10 -0700
Subject: Re: [EE] "Sunlight" brand LEDs
Thread-Topic: [EE] "Sunlight" brand LEDs
Thread-Index: AdZp84EUrQhH3NpTThGP0Wo67Q7Quw==
Message-ID:
 <CACZQxzNKswcHR1C6EkBhX9B2TgY2NAm37-+qxLNMBdr5YSMMsQ@mail.gmail.com>
References: <5F28A038.9060203@narwani.org>
In-Reply-To: <5F28A038.9060203@narwani.org>
Reply-To: Microcontroller discussion list - Public. <piclist@mit.edu>
Accept-Language: en-US
X-MS-Exchange-Organization-SenderIdResult: Pass
X-MS-Exchange-Organization-PRD: mit.edu
X-MS-TNEF-Correlator:
received-spf: Pass (protection.outlook.com: domain of gmail.com designates
	209.85.218.45 as permitted sender) receiver=protection.outlook.com;
	client-ip=209.85.218.45; helo=mail-ej1-f45.google.com;
dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com;
 s=20161025;
	h=mime-version:references:in-reply-to:from:date:message-id:subject:to	:cc;
 bh=iTvzLnSKDWKVqoTpu25NJ0qYhUkCDxNg5djHmYMsW4Y=;
	b=TdJGF3itqH3gPi0aDsXIRn5JTaZFAwAVXRMveFoIKO9xliWtfrQ0BMQVI3PVpIDSWQ
	ds29xZlGI2bH0osmm9E2tFUXiZwAL8OroaSE0Vtav4VRuReqeERCNbQ9R9Yw0zZERGTO
	Fs/3KiiVnqjsw23FM+jS5QrPZXTH92Zrt2ze3uzYdHt/n8nrKRc+cI143xJEftuGNJ9r
	wGab/2+UUN6DlszOsZTHciuSzFALupzfQsTEQEZ9ePRM+5xZCRYw6whXEKfrcar00do3
	ZLn5glXjqtPc5G5Ery9KfL2sbJNYM1oVerBd3SgwjA085TyiEQqZcHp3/dXZixu8r3+i	9RlA==
authentication-results: spf=pass (sender IP is 209.85.218.45)
	smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified)
	header.d=gmail.com; mit.edu;	dmarc=pass action=none header.from=gmail.com; 
errors-to: piclist-bounces@mit.edu
list-id: "Microcontroller discussion list - Public." <piclist.mit.edu>
list-post: <mailto:piclist@mit.edu>
x-beenthere: piclist@mit.edu
x-mailman-version: 2.1.6
x-received: by 2002:a17:906:4c97:: with SMTP id
	q23mr5907360eju.11.1596499247483; 	Mon, 03 Aug 2020 17:00:47 -0700 (PDT)
x-topics: [EE]
x-content-filtered-by: Mailman/MimeDel 2.1.6
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

On Tue, 4 Aug 2020 at 11:41, Neil <picdude3@narwani.org> wrote:

> Anyone have any mid-to-long-term experience with "Sunlight" brand
> 7-segment LED displays?
> Looking at these for a long product as the Lite-On LEDs I've used to
> date are in short supply, being discontinued.  And the ones I found from
> a broker were counterfeits, which have cost me considerably.
> Hence, looking for any reviews anyone can provide.
>
> I have NO experience of them.
Chinese LEDs seem to generally be of substantially higher longevity in most
cases than when I used them in largish volume around 10 years ago.
However, if Lite-On fakes are problematic then other names also may be.
Depending on what the issues are and what time you have available you may
be able to carry out longevity testing yourself.
At 168 hours/week, ~ 700 hrs/month you may start to get
lifetime indications in a useful time period when operated at top end
currents.

Output often rises initially.

I placed LED strings in series with a constant current source (say 10 LEDs)
plus a switchable reference in series - usually shorted out.
Occasional output checks using a lashup "integrating cone" and light meter
and multiple strings allowed early degradation to easily be seen.


       Russell

_SNS _LED
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.