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Technical Knowlegebase

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The luminaire luminous efficiency is the quotient of the emitted luminous flux and the electric power consumedby the luminaire. The value is expressed in lumen per watt (lm/W).

The luminous flux (Φ) of an LED module measured in lumen (lm). This value defines the luminous flux which is created by an LED module at an ambient temperature of 25 °C.

The luminous flux (Φ) of a luminaire measured in lumen (lm). This value defines the total luminous flux which is emitted by the luminaire.

The maximum electric rated voltage, measured in volts (V), at which a luminaire is allowed to be operated.Generally Standards are 8-12 VDC / 200-240 VAC

The colour rendering index (Ra) stands for the degree of conformity between the perceived colour of an object and its appearance under a specific light source.

Foreign body protection

IP Rating Protection against dust
IP 1x protection against penetration of foreign bodies ≥ 50 mm
IP 2x protection against penetration of foreign bodies ≥ 12 mm
IP 3x protection against penetration of foreign bodies ≥ 2,5 mm
IP 4x protection against penetration of foreign bodies ≥ 1 mm
IP 5x protection against harmful dust deposits
IP 6x protection against dust entry

Water protection

IP Rating Protection against water
IP x1 protection against drops of water falling vertically
IP x2 protection against drops of water from angles up to 15°
IP x3 protection against showers up to 60°
IP x4 protection against splash water
IP x5 protection against water jets
IP x6 protection against heavy downpours
IP x7 protection against immersion
IP x8...m protection against submersion

Impact Protection

IK Rating Protection Level Equivalent Impact
IK00 Not protected
IK01 Protected against 0.14 joules impact 0.25kg from 56mm
IK02 Protected against 0.2 joules impact 0.25kg from 80mm
IK03 Protected against 0.35 joules impact 0.25kg from 140mm
IK04 Protected against 0.5 joules impact 0.25kg from 200mm
IK05 Protected against 0.7 joules impact 0.25kg from 280mm
IK06 Protected against 1 joule impact 0.25kg from 400mm
IK07 Protected against 2 joules impact 0.5kg from 400mm
IK08 Protected against 5 joules impact 1.7kg from 300mm
IK09 Protected against 10 joules impact 5kg from 200mm
IK10 Protected against 20 joules impact 5kg from 400mm

Safety Classes

Safety class I

designates luminaires with an earth connection. Under fault conditions, the power supply is cut by an overload.

Safety class II

designates luminaires that, apart from functional insulation, have an additional protective insulation. Under fault conditions, no dangerous voltage can reach metal parts which can be touched. Many luminaires are available in Safety class I and also in Safety class II. Please inquire accordingly.

Safety class III

designates luminaires operating on extra-low safety voltage. They can only be connected to safety transformers in accordance with EN 61558/VDE 0570, EN 61347/VDE 712 or VDE 0100 Part 410.

About ZESS

About ZESS

It all begins with a passion for light. For 15 years, ZESS has been working with lighting designers, architects and planner to develop custom luminaires of the highest technical standard, which impress with their style and aesthetics. There is always one goal: to push the boundaries of the technically feasible, enabling visionary designs. We can meet this challenge because our employees in our design labs as well as production and sales locations around the world deliver top performance. Being on-site for our customers is essential for mutual success.