Technical Guide

Luminaire Inrush Data

IP Rating

The ingress protection (IP) code denotes the protection against solid objects, moisture and impact provided by the luminaire enclosure.


Foreign body protection - 1st IP digit

Test Mark Protection Type Protection
  IP 1XX Against foreign bodies ≥ 50 mm
  IP 2XX Against foreign bodies ≥ 12 mm
  IP 3XX Against foreign bodies ≥ 2.5 mm
  IP 4XX Against foreign bodies ≥ 1 mm
IP 5XX Against harmful dust deposits
IP 6XX Against dust entry


Water protection - 2nd IP digit

Test Mark Protection Type Protection
IP X1X Against drops of water falling vertically
IP X2X Against drops of water from angles up to 15°
ico_IPRating8.gif IP X3X Against showers up to 60°
IP X4X Against splash water
ico_IPRating4.gif IP X5X Against heavy downpours
ico_IPRating4.gif IP X6X Against water jets
ico_IPRating4.gif IP X7X Against immersion
IP X8X Against submersion


Mechanical impact protection - 3rd IP digit

Test Mark Protection Type Protection
IP XX1 Impact 0,225 joule
IP XX2 Impact 0,375 joule
IP XX3 Impact 0,500 joule
IP XX5 Impact 2,00 joules
IP XX7 Impact 6,00 joules
IP XX9 Impact 20,00 joules

Safety Symbols

17 The ENEC symbol (European Norm Electrical Certification) is a European test and certification symbol for luminaires and electrical components in luminaires.

Luminaires with the F mark can be fixed to normal flame-inhibiting materials (EN60598/VDE0711).

Luminaire Inrush Data

The LED luminaire protective device, MCB (supplied by others), has to be able to withstand the inrush current of the luminaire(s) without tripping. The inrush current of LED luminaires is determined by the driver(s) and is not proportional to the luminaire wattage or running current. LED luminaire inrush currents can be as high as 400 times the running current for a very short time, generally less than 500us. This inrush duration is significantly less than the 10ms lower limit for conventional MCB tripping. However, some MCBs have a second tripping functionality, for inrush durations less than 10ms, having an increasing tolerance to high inrush currents related to the logarithmic inverse of the duration. Therefore Holophane recommends the proposed MCB manufacturers should be consulted regarding the tolerance of their products to the expected inrush current parameters. Holophane publish a table of inrush current parameters for each luminaire so that a suitable MCB can be identified by the lighting circuit designer or specifier.

Circuit protection is the responsibility of the electrical installation designer, as such, Holophane cannot advise on the sizing of circuit protection devices to be used, other than to make available the relevant luminaire inrush data, available via our web site or upon request if not listed

The inrush parameters, using the above link, are obtained from the driver manufacturers. As LED driver technology is in its infancy, the specification of drivers is likely to change more frequently than the lighting industry has become accustomed with similar products. We would therefore recommend that the inrush parameters are confirmed using the link, at circuit design, and again immediately prior to luminaire ordering.




In today’s ultra-competitive environment, it is becoming increasingly important to reduce operating costs to improve profitability. Holophane is your expert when it comes to delivering the most efficient lighting solutions to help you achieve that goal. Taking advantage of the most advanced technologies available, you can achieve an energy saving of up to 60%* over existing installations based on a point for point replacement.
*Compared to a 400W HID circuit.

Lumen Ambient Temperature (LAT) Multipliers

  Lumen Multiplier
Ambient Interior Exterior
15°C   1.02
20°C   1.01
25°C 1.00 1.00
30°C 0.99 0.99
35°C 0.98 0.98
40°C 0.98 0.97
45°C 0.97 0.96
50°C 0.96  
55°C 0.96  
60°C 0.96  
65°C 0.95  
70°C 0.95