 |
 |
A very bright future for Power LEDs
The electronics industry is seeing a change
in the way that Light Emitting Diodes (LEDs)
are manufactured and subsequently used. Farnell
InOne has partnered with Future Electronics
to give access to the some of the brightest
LEDs currently available.
Billions
of LEDs are manufactured each year for use
in thousands
of product applications such as indicators and displays. Yet their relatively
low luminescence has failed to challenge incandescent
bulbs when high illumination is required. All this is about to change with the
development of Power LEDs.
 LEDs
surround us everywhere in the modern world.
They form the numbers on our digital clock
radios, they illuminate the function lights
on our car dashboards, they are the “power
on” indicator
light in countless home appliances from electric
shavers to DVD players, and they are the little “sentry” that
flashes in unison with data passing through your
PC’s modem or Ethernet network hub. It’s
no real surprise, therefore, that the tiny semiconductor
sandwich device that is the humble LED sells
in its billions each year.
But
the LED has not been without competition. In
particular, the incandescent bulb that traces
its roots back to Edison’s 1879 invention,
has reigned supreme in high illumination applications,
particularly those using white light. Domestic
lighting, car headlights and torches are just
some examples where traditionally incandescent
lighting provides the intense luminescence
needed to do the job and which conventional
LEDs simply cannot supply.
But
the LED manufacturers haven’t been
sitting idly by. The technological advantages
over incandescent light sources promised by
LEDs – plus
the lure of a considerable boost in revenues – have
led these companies to invest massively in
R&D
to develop brighter LEDs.
 This
has resulted in the evolution of a new breed
of LED: the so-called Power LED. The luminescence
of this new generation of LED is such that
they are able to challenge the domain of bright
incandescent light sources such as filament
bulbs, halogen lamps and fluorescent lamps.
They are also available in a full range of
colours.
For
electronics designers, Power LEDs have the
potential to free them from the restrictions
imposed by incandescent light sources. Unlike
the latter, Power LEDs can be switched on and
off almost instantaneously (less than 100ns)
at operating temperatures down to –40C,
have an extremely long life span of up to 100,000
hours, and offer dramatically higher energy
efficiency.
It is not an exaggeration to say that Power LEDs are set to revolutionise an
entire new generation of automotive, domestic and leisure lighting applications.
But
how does the performance of Power LEDs compare
to traditional LEDs, what kinds of Power LEDs
are now available and how can they be designed
into an application?
Conventional
LEDs are intrinsically simple devices based
upon an n-type/p-type semiconductor junction.
When electrons are encouraged to flow
across the junction by the application of
a small
voltage, their negative charge draws them
to the p-type “holes” (i.e.
atoms missing an electron). On meeting
a hole, the electron drops from a higher energy conduction
band to a lower orbital or valance band
(across the “band gap”) around the p-type
hole, emitting a photon in the process.
In the case of a “visible” LED, (as opposed
to the infrared type commonly used in TV
remote controls, for instance) the frequency of the
emitted photons is in the visible portion
of the electromagnetic spectrum. This frequency
determines the colour of the LED’s
emitted light.
Power LEDs are based upon exactly the same
physics. How they differ is that they have
been designed
to run ‘safely’ on upwards
of twice the power input (indeed some designs
are quoted
to run on 20 to 50 times the input). This
may sound like a simple development, but
designing
an LED package that is capable of safely
dissipating this extra heat without suffering
irreversible
over-heating damage has been an enormous
technical challenge that has only now been
solved.
There are currently two broad approaches. One
is based around doubling the number of input/output
leads to the LED from 2 to 4 and drawing heat
away from the device using these extra thermal
channels. Fairchild Semiconductor, Lumileds
and Vishay adopt this approach. The other is
to keep
the number of leads constant (i.e. 2) and design
the enhanced thermal management requirements
into the actual packaging of the device. This
approach is adopted by Lumileds.
All Power LEDs outperform incandescent
bulbs in virtually every way. In particular,
they
are more energy efficient. All incandescent
bulbs “waste” most
of the input electrical energy heating
up their filaments (hence the slow start
up
time), and
only a small proportion of this energy
is emitted as light, the rest is as heat.
Below is a summary of the main advantages that
Power LEDs have over incandescent bulbs:
• Instant-start (typically less than 100ns
opposed to an incandescent lamp’s
200ms), full
• colour, 100% light.
• Cold start capable (down to –40°C).
• Dynamic colour changes and white point tuning
is possible.
• Cool beam that’s safe to the touch.
• No IR radiation or UV components to the emitted
beam.
• Vivid saturated colours that don’t
require efficiency-reducing colour filters.
• No mercury in the light source.
• Very long operating life of up to 100,000
hours.
• Robust, vibration proof, solid-state lighting
solution.
• Compact source offers design flexibility
and unobtrusive hidden light designs.
• More energy efficient than incandescent and
most Halogen lamps.
• Low voltage DC operation (with no requirement
for a high-voltage starting arc).
• Minimal maintenance costs.
• Superior electrostatic discharge (ESD) protection.
• Fully dimmable without colour variation.
Note that LED dimming with Power LEDs is best
achieved using Pulse Width Modulation (PWM).
This is because the use of a constant current
limits the dimming ratio to 1:3. With PWM,
however, dimming is possible down to a ratio
of 1:10,000.
As noted above, the semiconductors making
up the LED determine the band gap, and
consequently, the colour of the device.
The traditional
material
is Aluminium Indium Gallium Phosphide (AlInGaP).
This is a mature technology capable of
producing light in the 584.5–645nm wavelength range,
corresponding to red, red-orange or amber light.
More recent technology uses Indium Gallium Nitride
(InGaN), producing light in the 440–550nm
region and enabling blue, cyan and green
devices.
Creating
white light from an LED source has always been
a challenge. The traditional method is to mix
red, green and blue sources, but a different
technique has been developed for Power LEDs.
This method has the advantage that it only
requires a single light source.
This technique uses a blue LED, allied to a
phosphorous coating. Some of the photons
emitted from the
blue Power LED strike a phosphorous coating
over the chip and reflector cup. These
photons are
absorbed by the phosphorous and re-emitted
as yellow. The combination of blue and
yellow light
appears white to the human eye.
Power LEDs generally come in voltages and currents
of up to 3.5V and 350mA respectively,
although Lumileds offers a 5W Emitter device
with a
rating of up to 6.8V at 700mA.
As
mentioned earlier, conventional surface mount
LEDs (for example, PLCC-2 packages, Figure
1) and through-hole LED (Figure
2) lamps tend
to dissipate heat via the connection leads.
Through-hole devices, however, can suffer from
a number of limitations. For example, they
have a high thermal resistance (over 200K/W);
consequently input power is limited to less
than 0.1W and therefore light output is typically
2-3lumens.
Because
of its better heat dissipation, an improvement
in power input and luminosity (by a factor
of 5) can be achieved by using a device with
four leads.
A thermal model for a conventional LED lamp mounted on a printed circuit board
is given by (in this case the die attach pad is connected to the cathode pin):
TJ = TA + PD(q J-P + q P-A) = TA + PD(q J-A)
Where:
TJ = LED junction temperature
TA = Ambient temperature
PD = Power dissipation, i.e. IF times VF
q J-P = Thermal resistance, junction to cathode pin
q P-A = Thermal resistance, pin to air
Given
that TA is fixed, to increase PD it is necessary
to significantly reduce the thermal resistance
(i.e. significantly increase the thermal conductivity)
of the junction pins. To do this using conventional
alloy materials is not possible, but by doubling
the number of pins it is possible to half the
effective thermal resistance to allow twice
the PD for the same LED junction temperature,
TJ.
Alternatively, in Lumileds Emitter devices, heat is dissipated from the chip
by mounting the LED chip on a copper slug, which is then mounted directly on
the substrate. This encourages heat loss by conduction from the bottom of the
chip (see Figure 3 and Figure
4) with the device’s terminal pins are
used for power supply only. When designing with the Lumileds Emitters it is
essential to mount them on a large heat sink (typically made of aluminium)
to ensure long life and consistent performance.
It’s
relatively simple to supply power to a Power
LED. Generally, it is best to apply constant
current by using a resistor in series to the
LED (see Figure 5). The disadvantage of this
solution is the dependence of the current on
the input voltage and the resulting change
in brightness should the voltage fall (for
example, in a battery-powered application).
An
improved solution is to activate the Power
LED using integrated voltage and current regulators
or integrated switching regulators. Figure
6, Figure 7, Figure
8 and Figure
9 illustrate
a sample activation using integrated switching
regulators (for example, from National Semiconductor)
Using
these components, it is simple to create LED
designs that remain at constant brightness
despite changing voltages or temperatures.
Integrated voltage and current regulators are
readily available in small package designs
(for example, SOT23) that can be used very
effectively in products such as battery-operated
Power LED torches.
Where Power LEDs are to be connected directly
to the mains supply, the use of ready-made
Power LED (ballast resistor-based)
power supplies is
recommended. These come in a variety
of power ratings and are comparable to the electronic
ballasts for 12V halogen lamps or for
fluorescent
lamps. These Power LED (ballast resistors)
power supplies are specially produced
for LED requirements
and simplify design issues.
| Using the versatility of a microcontroller |
Inexpensive and versatile microcontrollers
can add an element of sophistication
to Power LED-based
designs and are increasingly being
used in LED applications.
Contemporary microcontrollers include integrated
internal clocking, reset controller, analogue-to-digital
converters and PWM modules, among other elements.
Microcontrollers are available in small packages
(for example 8-pin surface mount devices),
including on-chip flash memory from less than
US$1 (depending
on volume). (See Figure
10 for an example.)
Due
to their technical advantages over incandescent
lighting, Power LEDs are increasingly
being used in innovative lighting applications.
The
emphasis
has shifted from classical signalling
applications to active lighting.
But Power LEDs open up many other exciting
possibilities for electronics designers.
The potential applications
range from hand-held torches through
advertising boards and on to wide area office
illumination. Power LEDs are already being
employed, for example, in car tail-lights,
where there resistance to
vibration, long life and low maintenance
make them ideally suited to the job.
Further, because certain types
emit no heat or UV radiation to
the front,
they
are particularly
ideal for lighting food cabinets,
shop windows and display cases.
And lab
examples of even
more
powerful devices – which could be used
for car headlights or street lighting – are
becoming available.
The best news is that the use and design of
Power LED applications is relatively
simple, provided
a few simple rules are followed.
Order |
Part |
Description |
1 |
10 |
50 |
4325163 |
LXHL-BW01 |
LED, Emitter
Batwing White |
7.64 |
7.01 |
6.31 |
4325175 |
LXHL-BM01 |
LED, Emitter
Batwing Green |
7.64 |
7.01 |
6.31 |
4325187 |
LXHL-BE01 |
LED, Emitter
Batwing Cyan |
7.64 |
7.01 |
6.31 |
4325199 |
LXHL-BB01 |
LED, Emitter
Batwing Blue |
7.64 |
7.01 |
6.31 |
4325205 |
LXHL-BR01 |
LED, Emitter
Batwing R Blue |
7.64 |
7.01 |
6.31 |
4325217 |
LXHL-BD01 |
LED, Emitter
Batwing Red |
5.66 |
5.19 |
4.67 |
4325229 |
LXHL-BL01 |
LED, Emitter
Batwing Amber |
5.66 |
5.19 |
4.67 |
4325230 |
LXHL-PW01 |
LED, Emitter
Lambert White |
7.64 |
7.01 |
6.31 |
4325242 |
LXHL-PM01 |
LED, Emitter
Lambert Green |
7.64 |
7.01 |
6.31 |
4325254 |
LXHL-PE01 |
LED, Emitter
Lambert Cyan |
7.64 |
7.01 |
6.31 |
4325266 |
LXHL-PB01 |
LED, Emitter
Lambert Blue |
7.64 |
7.01 |
6.31 |
4325278 |
LXHL-PR03 |
LED, Emitter
Lambert R Blue |
7.64 |
7.01 |
6.31 |
4325280 |
LXHL-PD01 |
LED, Emitter
Lambert Red |
7.64 |
7.01 |
6.31 |
4325291 |
LXHL-PH01 |
LED, Emitter
Lambert Red/Ora |
7.64 |
7.01 |
6.31 |
4325308 |
LXHL-PL01 |
LED, Emitter
Lambert Amber |
7.64 |
7.01 |
6.31 |
4325310 |
LXHL-MW1C |
LED, Star Hex
Batwing White |
7.94 |
7.28 |
6.56 |
4325321 |
LXHL-MM1C |
LED, Star Hex
Batwing Green |
7.94 |
7.28 |
6.56 |
4325333 |
LXHL-ME1C |
LED, Star Hex
Batwing Cyan |
7.94 |
7.28 |
6.56 |
4325345 |
LXHL-MB1C |
LED, Star Hex
Batwing Blue |
7.94 |
7.28 |
6.56 |
4325357 |
LXHL-MRRC |
LED, Star Hex
Batwing R Blue |
7.94 |
7.28 |
6.56 |
4325369 |
LXHL-MD1C |
LED, Star Hex
Batwing Red |
5.96 |
5.46 |
4.92 |
4325370 |
LXHL-ML1C |
LED, Star Hex
Batwing Amber |
5.96 |
5.46 |
4.92 |
4325382 |
LXHL-MW1D |
LED, Star Hex
Lambert White |
7.94 |
7.28 |
6.56 |
4325394 |
LXHL-MM1D |
LED, Star Hex
Lambert Green |
7.94 |
7.28 |
6.56 |
4325400 |
LXHL-ME1D |
LED, Star Hex
Lambert Cyan |
7.94 |
7.28 |
6.56 |
4325412 |
LXHL-MB1D |
LED, Star Hex
Lambert Blue |
7.94 |
7.28 |
6.56 |
4325424 |
LXHL-MRRD |
LED, Star Hex
Lambert R Blue |
7.94 |
7.28 |
6.56 |
4325436 |
LXHL-MD1D |
LED, Star Hex
Lambert Red |
7.94 |
7.28 |
6.56 |
4325448 |
LXHL-MH1D |
LED, Star Hex
Lambert Red/Or |
7.94 |
7.28 |
6.56 |
4325450 |
LXHL-ML1D |
LED, Star Hex
Lambert Amber |
7.94 |
7.28 |
6.56 |
4325461 |
LXHL-MW1A |
LED, Star W/Con
Batwing White |
7.96 |
7.3 |
6.57 |
4325473 |
LXHL-MM1A |
LED, Star W/Con
Batwing Green |
7.96 |
7.3 |
6.57 |
4325485 |
LXHL-ME1A |
LED, Star W/Con
Batwing Cyan |
7.96 |
7.3 |
6.57 |
4325497 |
LXHL-MB1A |
LED, Star W/Con
Batwing Blue |
7.96 |
7.3 |
6.57 |
4325503 |
LXHL-MRRA |
LED, Star W/Con
Batwing Blue |
7.96 |
7.3 |
6.57 |
4325515 |
LXHL-MD1A |
LED, Star W/Con
Batwing Red |
5.97 |
5.48 |
4.93 |
4325527 |
LXHL-ML1A |
LED,
Star W/Con Batwing Amber |
5.97 |
5.48 |
4.93 |
4325539 |
LXHL-MW1B |
LED, Star W/Con
Lambert White |
7.96 |
7.3 |
6.57 |
4325540 |
LXHL-MM1B |
LED, Star W/Con
Lambert Green |
7.96 |
7.3 |
6.57 |
4325552 |
LXHL-ME1B |
LED, Star W/Con
Lambert Cyan |
7.96 |
7.3 |
6.57 |
4325564 |
LXHL-MB1B |
LED, Star W/Con
Lambert Blue |
7.96 |
7.3 |
6.57 |
4325576 |
LXHL-MRRB |
LED, Star W/Con
Lambert Blue |
7.96 |
7.3 |
6.57 |
4325588 |
LXHL-MD1B |
LED, Star W/Conn
Lambert Red |
7.96 |
7.3 |
6.57 |
4325590 |
LXHL-ML1B |
LED, Star W/Con
Lambert Amber |
7.96 |
7.3 |
6.57 |
4325606 |
LXHL-FW1C |
LED, Star Side
Emitter White |
7.96 |
7.3 |
6.57 |
4325618 |
LXHL-FM1C |
LED, Star Side
Emitter Green |
7.96 |
7.3 |
6.57 |
4325620 |
LXHL-FE1C |
LED, Star Side
Emitter Cyan |
7.96 |
7.3 |
6.57 |
4325631 |
LXHL-FB1C |
LED, Star Side
Emitter Blue |
7.96 |
7.3 |
6.57 |
4325643 |
LXHL-FR1C |
LED, Star Side
Emitter Blue |
7.96 |
7.3 |
6.57 |
4325655 |
LXHL-FD1C |
LED, Star Side
Emitter Red |
7.96 |
7.3 |
6.57 |
4325667 |
LXHL-FL1C |
LED, Star Side
Emitter Amber |
7.96 |
7.3 |
6.57 |
4325679 |
LXHL-MW1E |
LED, Star Idc
White |
7.96 |
7.3 |
6.57 |
4325680 |
LXHL-MM1E |
LED, Star Idc
Green |
7.96 |
7.3 |
6.57 |
4325692 |
LXHL-ME1E |
LED, Star Idc
Cyan |
7.96 |
7.3 |
6.57 |
4325709 |
LXHL-MB1E |
LED, Star Idc
Blue |
7.96 |
7.3 |
6.57 |
4325710 |
LXHL-MR1E |
LED, Star Idc
Royal Blue |
7.96 |
7.3 |
6.57 |
4325722 |
LXHL-MD1E |
LED, Star Idc
Red |
5.97 |
5.48 |
4.93 |
4325734 |
LXHL-ML1E |
LED, Star Idc
Amber |
5.97 |
5.48 |
4.93 |
4325746 |
LXHL-NW98 |
LED, Star W/Optic
White |
10.91 |
10.01 |
9.02 |
4325758 |
LXHL-NM98 |
LED, Star W/Optic
Green |
10.91 |
10.01 |
9.02 |
4325760 |
LXHL-NE98 |
LED, Star W/Optic
Cyan |
10.91 |
10.01 |
9.02 |
4325771 |
LXHL-NB98 |
LED, Star W/Optic
Blue |
10.91 |
10.01 |
9.02 |
4325783 |
LXHL-NRR8 |
LED, Star W/Optic
Royal Blue |
10.91 |
10.01 |
9.02 |
4325795 |
LXHL-ND98 |
LED, Star W/Optic
Red |
8.93 |
8.19 |
7.38 |
4325801 |
LXHL-NL98 |
LED, Star W/Optic
Amber |
8.93 |
8.19 |
7.38 |
4325813 |
LXHL-LW6C |
LED, V Star
White |
23.87 |
21.89 |
19.71 |
4325825 |
LXHL-LM5C |
LED, V Star
Green |
23.87 |
21.89 |
19.71 |
4325837 |
LXHL-LE5C |
LED, V Star
Cyan |
23.87 |
21.89 |
19.71 |
4325849 |
LXHL-LB5C |
LED, V Star
Blue |
23.87 |
21.89 |
19.71 |
4325850 |
LXHL-LR5C |
LED, V Star
Royal Blue |
23.87 |
21.89 |
19.71 |
4325862 |
LXHL-FW6C |
LED, V Star
Side Emit White |
23.86 |
21.88 |
19.71 |
4325874 |
LXHL-FM5C |
LED, V Star
Side Emit Green |
23.86 |
21.88 |
19.71 |
4325886 |
LXHL-FE5C |
LED, V Star
Side Emit Cyan |
23.86 |
21.88 |
19.71 |
4325898 |
LXHL-FB5C |
LED, V Star
Side Emit Blue |
23.86 |
21.88 |
19.71 |
4325904 |
LXHL-FR5C |
LED, V Star
Side Emit Ryl Blue |
23.86 |
21.88 |
19.71 |
4325916 |
LXHL-PW03 |
LED, V White |
22.97 |
21.07 |
18.97 |
4325928 |
LXHL-PM02 |
LED, V Green |
22.97 |
21.07 |
18.98 |
4325930 |
LXHL-PE02 |
LED, V Cyan |
22.97 |
21.07 |
18.97 |
4325941 |
LXHL-PB02 |
LED, V Blue |
22.97 |
21.07 |
18.98 |
4325953 |
LXHL-PR02 |
LED, V Royal
Blue |
22.97 |
21.07 |
18.97 |
4325965 |
LXHL-DW03 |
LED, V Side
Emit White |
22.97 |
21.07 |
18.97 |
4325977 |
LXHL-DM02 |
LED, V Side
Emit Green |
22.97 |
21.07 |
18.97 |
4325989 |
LXHL-DE02 |
LED, V Side
Emit Cyan |
22.97 |
21.07 |
18.97 |
4325990 |
LXHL-DB02 |
LED, V Side
Emit Blue |
22.97 |
21.07 |
18.97 |
4326003 |
LXHL-DR02 |
LED, V Side
Emit Royal Blue |
22.97 |
21.07 |
18.97 |
4326015 |
LXHL-NX05 |
Collimating Optic |
1.46 |
1.35 |
1.23 |
4326027 |
HPWN-MB00-00000 |
LED, Superflux Blue |
1.02 |
0.93 |
0.84 |
4326039 |
HPWN-MG00-00000 |
LED, Superflux Green |
1.02 |
0.93 |
0.84 |
4326040 |
HPWN-MC00-00000 |
LED, Superflux Cyan |
1.02 |
0.93 |
0.84 |
4326052 |
HPWT-MD00-00000 |
LED, Superflux Red |
0.34 |
0.32 |
0.28 |
4326064 |
HPWT-MH00-00000 |
LED, Superflux Red/Orange |
0.34 |
0.32 |
0.28 |
4326076 |
HPWT-ML00-00000 |
LED, Superflux Amber |
0.26 |
0.24 |
0.22 |
4894340 |
FHS-HNB1-LB01-0 |
Lens, Batwing Narrow
Beam |
3.51 |
3.19 |
3.08 |
4894352 |
FHS-HNB1-LB01-H |
Lens, Batwing Nrw Beam
W/Hldr |
4.54 |
4.13 |
3.98 |
4894364 |
FHS-HNB1-LL01-0 |
Lens, Lamb'n Nrw Beam |
3.87 |
3.52 |
3.39 |
4894376 |
FHS-HNB1-LL01-H |
Lens, Lamb'n Nrw Beam
W/Hldr |
4.54 |
4.13 |
3.98 |
4894388 |
FHS-HMB1-LB01-0 |
Lens, Batwing Medium
Beam |
3.51 |
3.19 |
3.08 |
4894390 |
FHS-HMB1-LB01-H |
Lens, Batwing Med Beam
W/Hldr |
4.54 |
4.13 |
3.98 |
4894406 |
FHS-HMB1-LL01-0 |
Lens, Lamb'n Medium
Beam |
3.87 |
3.52 |
3.39 |
4894418 |
FHS-HMB1-LL01-H |
Lens, Lamb'n Med Beam
W/Hldr |
4.54 |
4.13 |
3.98 |
4894420 |
FHS-HWB1-LB01-0 |
Lens, Batwing Wide
Beam |
3.51 |
3.19 |
3.08 |
4894431 |
FHS-HWB1-LB01-H |
Lens, Batwing Wide
Beam W/Hldr |
4.54 |
4.13 |
3.98 |
4894443 |
FHS-HWB1-LL01-0 |
Lens, Lamb'n Wide Beam |
3.87 |
3.52 |
3.39 |
4894455 |
FHS-HWB1-LL01-H |
Lens, Lamb'n Wide Beam
W/Hldr |
4.54 |
4.13 |
3.98 |
4894467 |
FHS-HEB1-LB01-0 |
Lens, Batwing Elliptical
Beam |
3.51 |
3.19 |
3.08 |
4894479 |
FHS-HEB1-LB01-H |
Lens, Batwing Ellip
Beam W/Hldr |
4.54 |
4.13 |
3.98 |
4894480 |
FHS-HEB1-LL01-0 |
Lens, Lamb'n Elliptical
Beam |
3.87 |
3.52 |
3.39 |
4894492 |
FHS-HEB1-LL01-H |
Lens, Lamb'n Ellip
Beam W/Hldr |
4.54 |
4.13 |
3.98 |
4908934 |
LXHL-BW02 |
LED Emitr, Btwing
Wht |
7.34 |
6.61 |
6.01 |
4908946 |
LXHL-MWEC |
LED, Star Hex
Btwng Wht |
7.63 |
6.87 |
6.25 |
4908958 |
LXHL-MWEA |
LED, Star W/Con
Bat Wht |
7.65 |
6.89 |
6.26 |
4908960 |
LXHL-NWE8 |
LED, Str/C/Optic
Bat Wht |
10.49 |
9.44 |
8.59 |
4908971 |
LXHL-MWGC |
LED, Star Hex
Bat Wm Wht |
7.18 |
6.46 |
5.88 |
4908983 |
LXHL-BW03 |
LED, Emitter
Batwing Wht |
7.18 |
6.46 |
5.88 |
4908995 |
LXHL-PW09 |
LED, Iii Emit
Lamb Wht |
9.27 |
8.34 |
7.58 |
4909008 |
LXHL-PM09 |
LED, Iii Emit
Lamb Grn |
9.79 |
8.81 |
8.01 |
4909010 |
LXHL-PE09 |
LED, Iii Emit
Lamb Cyan |
9.79 |
8.81 |
8.01 |
4909021 |
LXHL-PB09 |
LED, Iii Emit
Lamb Blue |
9.79 |
8.81 |
8.01 |
4909033 |
LXHL-PR09 |
LED, Iii Emit
Lamb Rblue |
9.79 |
8.81 |
8.01 |
4909045 |
LXHL-LW3C |
LED, Iii Starhx
Lam Wht |
9.6 |
8.64 |
7.86 |
4909057 |
LXHL-LM3C |
LED, Iii Starhx
Lam Grn |
10.12 |
9.11 |
8.28 |
4909069 |
LXHL-LE3C |
LED, Iii Starhx
Lam Cyan |
10.12 |
9.11 |
8.28 |
4909070 |
LXHL-LB3C |
LED, Iii Starhx
Lam Blue |
10.12 |
9.11 |
8.28 |
4909082 |
LXHL-LR3C |
LED, Iii Starhx
Lm Rblue |
10.12 |
9.11 |
8.28 |
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