doublepower!! SKY

Highly efficient and modular industrial LED luminaire for even the most demanding installations


Unique features

  • Highly efficient passive cooling system due to the unique profile construction
  • For ambient temperatures between –40 °C and +65 °C (TaMAX version)
  • Temperature parameters verified in a laboratory – the difference between the ambient temperature and the temperature (Tc) on the chip’s transition is only 18 °C for Ta = 50 °C
  • The luminaire’s luminous flux efficacy at least 138 lm/W
  • Modular construction, with the possibility to arrange more modules in series or in parallel, the possibility to apply one or more drivers for the set
  • IP65 protection
  • Lifetime >100 000 hours (complete fixture including the LED sources and drivers)
  • Warranty up to 8 years

Thermal management

termo-skyThe temperature is one of the main parameters in LED luminaries operation, as it influences the performance and life span of LED fixtures. The problem of temperature construction and selection of appropriate electronic components is the cornerstone, which has to be much more robust in case of industrial luminaires that are subject to high ambient temperatures and heavy pollution. The luminaire doublepower!! SKY was designed for operation in ambient temperatures from –30 °C to +50 °C; the TaMAX version can be used in environments with ambient temperatures from –40 °C to +65 °C, temporarily it can withstand temperatures up to 80 °C.

A great emphasis was given to prevent individual components from working on the verge of their limiting values, but rather in comfortable conditions in which their maximum lifetime will be ensured. Thus, we count not only on the component’s temperature on the temperature checkpoint (Tc), but also with the ambient temperature.

LED driver and temperatures

For each LED electronic driver, two basic temperature data are provided: the Ta and Tc limiting values, where Ta is the temperature of the immediate surroundings of the driver (i.e. inside the lighting fixture) and Tc is the temperature on driver’s reference point. In order to ensure the durability and reliability of the power source, both values have to be respected.

Limiting values of truly industrial drivers might be e.g. Ta = +85 °C and Tc = +99 °C. Even at ambient temperature of +50 °C it is already highly demanding not to exceed the power source limit values within the construction.

In case of doublepower!! SKY luminaire, the difference between the temperature of the environment and the temperature inside the lighting fixture and at the reference points is less than 20 °C! Therefore, the doublepower!! SKY luminaire and all of its components operate at a high comfort, even at ambient temperatures of the luminaire’s surrounding of +65 °C (doublepower!! TaMAX design).

LED sources and temperatures

Similarly to the LED drivers, LED sources have their limiting temperatures. Furthermore, in case of LED sources, the luminous flux efficacy increases with the decreasing temperature of the LED chip. Therefore, ensuring lower operating temperatures of the LED sources is important not only to ensure the lifetime and slow decreasing of luminous flux in time, but also to achieve high efficiency of LED power sources (lm/W ratio).

Considering the doublepower!! SKY luminaire, the temperature of LED chips does not exceed the ambient temperature of the environment by more than 20 °C. LED chips work at maximum output even at ambient temperatures of +65 °C. At lower ambient temperatures, the highly efficient heat dissipation brings about further positive effect – the efficiency of the LED sources increases.

Heat transition from LED sources – heat-conducting materials

The use of the correct material for heat dissipation from LED chips to the heat sink and the choice of a correct technology for the material coating application are of key importance. Even the smallest gaps between the chip and the heat sink may cause a rapid damage to the chip. The layer of the applied material differs for each type of material depending on its heat-conducting properties, and it is indicated in centesimal of millimetres. Even the highly efficient heat-conductive paste or pad may easily become a thermal barrier due to the incorrect thickness or application.

doublepower!! SKY uses special 3M heat-conducting tapes, precisely calculated according to the LED sources used, and installed using a special technological procedure to ensure perfect and rapid heat dissipation.

Optical system

In the doublepower!! SKY luminaires, we use special highly resistant LED lenses, which do not degrade in time. We use lenses of the renowned quality producers only. Based on the lens type, the light transmittance of the optics used ranges from 92 % to 96 % (documented by measurements and technical sheets of the lens producer). We verify the lighting characteristics ourselves, using independent institutions such as the laboratories of the Technical and Mining University in Ostrava.

In order to reach low glare values, a larger amount of the LED chips and lens with larger area are used. Moreover, the optical system is embedded into the luminaire’s body to further reduce the glare effect.

The doublepower SKY luminaire may be equipped with a glass cover. We use a special tempered borosilicate AGC glass with low iron content and the best light transmittance on the market being 92 %.

Operations with high dustiness and demanding conditions

The highly efficient heat dissipation and the thermal management of the doublepower!! SKY luminaire was designed in a way to withstand the operating conditions where extreme dustiness and other environmental challenges occur. The heat dissipation function is ensured even in conditions when massive accumulation of dust or grease on the lighting fixture occurs (e.g. in the foundries), due to the following features:

  • for calculating the necessary lighting fixture surface for efficient heat dissipation, horizontal parts (that are most exposed to dirt) are not included;
  • the luminaires’ profiles are adequately dimensioned to ensure efficient heat dissipation even when the profile is covered with dust in demanding industrial operations;
  • the cooling fins are positioned vertically on the bottom part of the lighting fixture, which prevents the accumulation of dust on the cooling fins;
  • the luminaire’s body is dimensioned not only with the respect to surface area, but also with respect to the thickness of the body at key areas, in a way to ensure the heat dissipation possible is as quick as possible.

Easy installation and maintenance

The modular construction of the doublepower!! SKY luminaire and the assembly system, which will adapt to any limitations within the industrial operations, reduce the installation and maintenance costs.


Wattage 74.6 W 111.9 W 149.2 W 186.5 W 223.8 W 298.4 W 373.0 W
Luminaire’s luminous flux 10 727 lm 16 091 lm 21 455 lm 26 818 lm 32 182 lm 42 909 lm 53 636 lm
Efficiency of luminous flux source: 151.0 lm/W, luminaire: 143.8 lm/W
Light source CREE XP-L2
Chromatic temperature 4 000–6 500 K
Lifespan of luminaire L80B10 > 100 000 hours for Ta +50 °C (+ 65 °C for TaMAX version)
Lifespan of electronics > 100 000 hours (Tridonic GmbH)
Front cover PMMA, optional 3 mm tempered borosilicate glass cover
High visible light transmittance, antistatic effect, no degradation in time
Body Unique pressed aluminium profile, eloxed
Highly efficient heat dissipation for optimal thermal management of the luminaire
Low operating temperatures = prolonged lifetime of all components
Protection IP65
Ambient temperatures –30 °C ~ +50 °C (–40 °C ~ +65 °C for TaMAX version)
Optical system and reflectors System of PMMA optical elements with various light distribution characteristics based
on the luminaire’s application
Low glare levels
Others No stroboscopic effect in case of rotatory machines
Optional continuous regulation using DALI/DSI, optional connection to complex intelligent control system
Easy to install and service due to flexible connection points and GESIS connectors

Recommended application

Variant luminaire SKY SKY taMAX
The main ceiling lighting tak  tak
Local lighting (machines and jobs) tak tak
Production facilities in heavy industries tak  tak
Production facilities in light industries tak
Warehouse premises with free storage (Expedition) tak
Storage space with shelf aisles (high shelving)  tak
Ice stadiums tak  tak
Other sports centers  tak  tak
Shopping centers tak
Graphic and photographic studios (* TRUELIGHT variant)
Extremely dusty and aggressive environments tak tak
Environments with very high temperatures tak
Low mounting height (2–5 meters)  tak tak
Middle mounting height (5–12 meters)  tak  tak
High mounting height (12–18 meters)  tak tak
Very high mounting heights (18–30 meters)  tak  tak