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OLED & LIGHTING

10

No 19 | July 2017 |

OPE

journal

Ideal for living and

ambient lighting

OLED lighting boasts an outstand-

ing quality, which can be associated with

well-being and cosiness. This is mainly due

to the unique technology, which gener-

ates the natural white light of the OLED.

It is made possible by the “additive” light

mixture of several single light colours:

They are created in different, overlaying,

light-emitting layers and add up together

to white light. Thus, a broader colour

spectrum is contained within the light,

which leads to the very good colour render-

ing. Consequently, OLED is an ideal light

source for living and ambient lighting.

The generation of white light works

differently in an LED. LEDs are, depend-

ing on the semiconductor material in

use, also available in different colours.

White LEDs for usage in lighting materi-

als are mostly blue LEDs with a yellow

luminescent layer made of phosphor. The

layer serves as wavelength converter, i.e.

it transforms the originally blue light into

white. Therefore, some (mostly cheap)

LED lighting materials appear bluish.

When finished OLED lighting materi-

als are used, light is generated from an

immaterial surface. It is therefore pos-

sible to create lamps that work with an

absolute minimum of additional materi-

als and components. OLED lamps such

as those from the “OMLED One” series

do not require cooling bodies and diffu-

sors or reflectors for glare elimination.

With OLEDs, different light tempera-

tures (measured in Kelvin) can be gener-

ated. The “OMLED One” lamp family,

for instance, was consciously designed

as cosy and relaxing light and therefore

equipped with OLED panels with warm

white light temperature. There are also

OLED panels with 4000K, whose neutral

white light is suitable very well for working.

The efficiency of

OLED light increases

The luminous flux describes the radiation

that light sources emit in the form of visible

light. It is measured in lumen (lm). At an

even power output (Watt), an LED light-

ing material offers a seven to eight times

higher luminous flux compared to a light

bulb. The luminous flux of the OLED lies in

between these two values with 3000 lumen.

If one relates the luminous flux of a light-

ing material with the power output, a value

for efficiency will be the result: the light

yield. The development of LEDs has raised

the bar in this regard very high. Nowadays,

LEDs attain nine to ten times the light yield

of a light bulb. OLED, however, has in the

meantime reached the already high efficiency

of an energy-saving lamp. In the future,

i.e. in a few years, it will reach the level of

today’s LEDs. Then, OLEDs will be able to

attain a light yield of 100 lumen per Watt.

Just like LEDs, OLEDs boast a long

operating life. In the lamp family OMLED

One, the operating life ranges at 30 000

hours at 70% luminous flux. Afterwards,

the luminosity may sink to below 70%

of the original value. However, the lamp

does not need to be disposed in this case,

as the modular OLED panels of the lamp

family OMLED One can even be replaced.

Patented:

Electronics on glass

For the manufacture of the lamp family

OMLED One, emdedesign uses a technology

that is completely new within the light-

ing industry. The housing of the lamp is

simultaneously circuit board and a control

element made of glass. This is enabled by a

new and patented manufacturing process

developed in Germany, which entails the

application of conductor tracks, electronic

building parts, contacts and a circuitry for

the dimming of the light on the high-quality

white glass. In this way, a conventional

board made of plastics is superfluous and

the installation height of the lamp can

be reduced significantly. All components

of the lamp are made in Germany.

Photos: © David Mertl @ emdedesign

Sources for the tables: emdedesign;

Stiftung Warentest „Gutes Licht“

Ideal for living and ambient lighting

Light colours (Kelvin)

Candle

1900K

Light bulb

2700K

Fluorescent lamp, warm white 2700K

OLED; warm white (e.g.

OMLED One s5)

2800K

OLED; neutral white

4000K

Fluorescent lamp, neutral white 4000K

Fluorescent lamp,

daylight white

6500K

Daylight (sun)

6000K

Patented: Electronics on glass

Luminous flux (lumen)

Light bulb, 60W 730lm

OLED, 60W 3000lm

LED, 60W

6000lm

Light yield (relation of

light to power output)

Light bulb

12.2lm/W

57W halogen bulb 16lm/W

18W energy-

saving lamp

58lm/W

5W OLED module 60lm/W

8W LED lamp

100lm/W