From: RussellMc <apptechnz@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
CC: ApptechNZ <apptechnz@gmail.com>
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Date: Mon, 7 Sep 2020 13:55:41 -0700
Subject: Re: [OT] World's brightest LED
Thread-Topic: [OT] World's brightest LED
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On Tue, 8 Sep 2020 at 06:56, Mike <pic.developer@gmail.com> wrote:

> Luminous efficacy is ~80lm/W which is very ordinary by today's
> standards.  Possibly of more interest to Russel would be the new Samsung
> LM301B, a low-mid power surface mount LED with 220 lm/W efficacy  which
> is not too far from the theoretical limit of a phosphor based white LED
> (260-300lm/W).
>
> https://www.samsung.com/led/lighting/mid-power-leds/3030-leds/lm301b/
>
>
> They look useful. Here we go again :-)

My "best" (Nichia) LEDS longish ago managed 165 l/W at about 100 mW and 130
l/W at 200 mW.
That was about as good as was available commercially then at sensible
prices.
When compared on equal terms (CCT, CRI, binning, ...) the Samsung LEDs
appear to be in the 150% - 200% better l/W range.
Half angle of illumination was 40 degrees against 60 for the Samsung which
was useful in my applications.
(1/2 brightness but far more than half light energy withing that angle).

Datasheet *here
<https://cdn.samsung.com/led/file/resource/2020/03/Data_Sheet_LM301B_CRI80_=
Rev.10.0.pdf>
*(26
pages)  ref1

Digikey offer SPMWHD32AMD5XAV0S0
Closest in datasheet is SPMWHD32AMD5XAV0S

This is a 3000 degrees K "whole bin"  part meaning you'll get low flux
items (and MAY get some high ones as well :-) ).
Digikey product page *here
<https://www.digikey.co.nz/product-detail/en/samsung-semiconductor,-inc./SP=
MWHD32AMD5XAV0S0/1510-2376-1-ND/8568392?gclid=3DCjwKCAjwtNf6BRAwEiwAkt6UQh2=
E-rBnsn67oP0BcI4Tqn64ao59y3Z3ku3Y6lDwosZ0b8Pt-YpAZRoCz0IQAvD_BwE>*
ref3
At $US0.18 / 1000 that's amazingly good.

The 1.5 kW super LED was CCT 5600K (colour temperature) BUT also CRI =3D 95
(Colour rendering index).
To get true high CRI you usually need a CCT somewhat under 3000 K to match
tungsten.
The Samsung has CRI=3D80 which is fine for use where you don't want colours
to look abnormal but where colour matching is not important.

At 5700 K the Samsung gives flux of 38-40 lumen in the SL bin.
To see what you can really buy you need to analyse what the datasheet says
with some care as you have binnings and groupings for Vf (forward voltage),
CCT, flux and position relative to the black body axis on the
They do say
 Kitting Bin Concept
1. Under agreement between customer and SAMSUNG ELECTRONICS, SAMSUNG can
supply kitting bin (VF, Color, lm).
2. A forward voltage (VF) of kitting bin is combined by a pair of same VF
rank such as (AY+AY), (AZ+AZ) or (A1+A1)
3. A Chromaticity Coordinates of kitting bin is mixed by kitting
procedure.(below kitting simulation)
4. A luminous flux(lm) of kitting bin is combined by a pair of IV rank such
as (SH+SH), (SH+SJ), (SJ+SJ), (SJ+SK), (SK+SK), (SK+SL), (SL+SL), (SL+SM)
or (SM+SM)

You are going to pay more for a low Vf (high efficiency), specific CCT &
CRI version but the price still is liable to be good.
In many applications the CRI is not too critical and even changes of flux
(light out) of say 20% are quite likely not to be noticeable.

On page 15 is the Beam Angle curve which may make a significant difference
in some applications.
In my portable lighting applications it was useful if an LED had a low
enough cone angle to be usable wholly or partially without reflector or
lens. This (potentially) reduces both cost and additional light loss.
In many other applications (grow lights, room lights, ...) the angle may be
acceptable as is or the application not so cost sensitive that beam shaping
matters. (Street lights almost invariably use lenses, grow lights probably
don't,...)

The Samsung half intensity angle is +/- 60 degrees or 120 degrees full
angle.
This is typical of silicone encapsulated LEDs

More anon maybe.
Other calls ....

400 Watt growlight using them *here
<https://herbals.co.nz/products/quantum-board-led-grow-light-samsung-lm301b=
-with-meanwell-driver>
 ref2*




            Russell

Just in case links above break:

ref1:
https://cdn.samsung.com/led/file/resource/2020/03/Data_Sheet_LM301B_CRI80_R=
ev.10.0.pdf

ref2:
https://herbals.co.nz/products/quantum-board-led-grow-light-samsung-lm301b-=
with-meanwell-driver

ref3:
https://www.digikey.co.nz/product-detail/en/samsung-semiconductor,-inc./SPM=
WHD32AMD5XAV0S0/1510-2376-1-ND/8568392?gclid=3DCjwKCAjwtNf6BRAwEiwAkt6UQh2E=
-rBnsn67oP0BcI4Tqn64ao59y3Z3ku3Y6lDwosZ0b8Pt-YpAZRoCz0IQAvD_BwE
--=20
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