24 JULY/AUGUST 2017 LEDsmagazine.com
exhibition | LIGHTFAIR 2017
says offers 58% more lumen density
than competing products.
At Samsung’s exhibit, the message was products across the sectors
that deliver efficacy levels at the top
of the industry. For instance, we
recently covered a mid-power
announcement where the LM301B
3.0× 3.0-mm LED delivers 220 lm/W.
But in our video interview with Samsung on the show floor, Brian Wilcox,
senior director of LED sales, said
Samsung now offers top efficacy in
high-power and COB products
despite being better known for mid-power LEDs ( http://bit.ly/2tXZu9a).
The LED sector in which we were
most interested at LFI was chip-scale package (CSP) LEDs. We have
been following what is presumably the
next major advancement for LEDs for several years, although the general lighting
market has been slow to adopt CSP LEDs
in part because of the difficulty in assembling products based on the LEDs (http://bit.
Samsung’s Wilcox said its CSP LEDs have
hit efficacy levels of 180 lm/W — matching
high-power LED performance. And the Samsung CSP LEDs are being used across power
ranges just as we reported about Seoul Semiconductor CSP LEDs last year (http://bit.
ly/2k43XT1). Moreover, Samsung demonstrated a number of Level 2 light engines
based on CSP LEDs that can make it easier for lighting manufacturers to adopt the
technology (Fig. 2). Wilcox also said Samsung had developed a new optical approach
to deliver light solely from the top side of
a CSP LED, whereas the company’s earlier
products had been five-sided emitters.
Seoul is the one LFI exhibitor that had
proof positive of CSPs pervading general
lighting applications. Acuity Brands allowed
Seoul to exhibit two such street lights that
are based on Level 2 modules provided by
Seoul with CSP LEDs on board. The Litho-nia Kax luminaire uses multiple arrays of
four of Seoul’s smallest CSP LEDs that end
up grouped under a total internal reflection
(TIR) optic. The Autobahn luminaire uses
multiple larger individual CSP LEDs, with
each under a TIR lens.
Moving to LED driver design, Seoul also
made news in that area at LFI, announcing
the NanoDriver and MicroDriver products.
The NanoDriver (Fig. 3) is what is sometimes
called a hybrid module that integrates one or
more ICs along with discrete electronic components. Still, the NanoDriver is only slightly
larger than a typical IC and can be assembled
on a printed-circuit board (PCB) or light engine
using surface-mount device (SMD) technology
just as SMD ICs are handled.
The NanoDriver essentially uses the latest generation of Seoul’s Acrich or AC-LED
technology, although Seoul is not using the
Acrich brand with the new
products. When combined
with a handful of discrete
external components, the
NanoDriver can power
multiple segments of
LEDs connected in series,
although the configuration of the LED strings is
necessarily different from
the simple series strings
used with constant-cur-rent DC drivers.
The value proposi-
tion of NanoDriver is size
and therefore PCB real
estate, along with low
cost. The design supports
and can also be used in 0–10V systems. The
MicroDriver, meanwhile, is a NanoDriver
and required external components encap-
sulated in a plastic package. Seoul said it
can be integrated in the small format of a
sconce fixture. Learn more about the Seoul
LFI announcements in a video shot at LFI
In modular driver news, Thomas Research
Products (a Hubbell business) demonstrated
its LBU10-P Emergency LED driver that’s
intended to complement a standard driver in
a luminaire. Emergency lighting is a regulatory requisite in commercial buildings. One
way to address the requirement is by adding
emergency power capability to a percentage
(perhaps 25% or 33%) of the overall luminaire
population in a building.
The Thomas product includes a nick-el-cadmium battery and intelligent charger that simply ensures the driver remains
capable of supplying emergency power at all
times. When a luminaire equipped with the
product loses power, an automatic transfer
switch in the Thomas driver swaps the load
to battery power and can deliver constant
illumination for 90 minutes.
Other enabling technologies
Enabling innovations, in fact, showed up
in myriad forms at LFI. Consider materials. Dow Corning demonstrated three new
silicone formulations. Silicone has become
more popular for optics in SSL applications
despite the fact that the material is more
expensive than polycarbonate or acrylic.
larger optics such
as TIR lenses for
COB LEDs and has
FIG. 2. Samsung Level 2 light engines based on
CSP LEDs enable luminaire features such as
FIG. 3. The NanoDriver from Seoul
Semiconductor implements AC-LED
technology in an extremely compact
form, enabling usage in smaller light
engines and luminaires.