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Zumtobel Moisture-proof diffuser luminaire AMPHIBIA PM

DLG-APPROVED "Resistance to ammonia"

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The approval

A test mark „DLG-APPROVED for individual criteria“ is awarded for agricultural products which have successfully fulfilled a scope-reduced usability testing conducted by DLG according to independent and recognized evaluation criteria. The test is intended to highlight particular innovations and key criteria of the test object. The test may contain criteria from the DLG test scope for overall tests, or focus on other value-determining characteristics and properties of the test subject. The minimum requirements, test conditions and procedures as well  as the evaluation bases of the test results will be specified in consultation with an expert group of DLG. They correspond to the recognized rules of technology, as well as scientific and agricultural knowledge and requirements. The successful testing is concluded with the publication of a test report, as well as the awarding of the test mark which is valid for five years from the date of awarding.

The ammonia resistance test was performed as a laboratory test according to the patented DLG test standard. This test is intended to determine the suitability of equipment for animal living areas to withstand the impacts of animal environments. The cleaning distance test assesses the suitability for cleaning animal living areas.

Other criteria were not tested. As of 2017 the luminaires will be operated in the test chamber both passively (without power supply) as well as actively according to a determined test program.

Assessment – Brief Summary

The moisture-proof diffuser luminaire AMPHIBIA PM has successfully com­pleted the DLG test for ammonia resistance. According to this result, it can be assumed that these luminaires are resistant to the typical environmental conditions of animal living areas and that no accelerated reduction of the product lifetime will occur. In addition, the moisture-proof diffuser luminaire AMPHIBIA PM was operated actively in the chamber for the entirety of the test. No product damage was observed here.

Table 1: Overview of results

Test result Evaluation*
Resistance to ammonia of the luminaire housing  
resistant +

*  Evaluation range:
resistant  + 
partly resistant ◯
non-resistant –

The Product

Description and Technical Data

The moisture-proof diffuser luminaire AMPHIBIA PM tested here is suitable for use in animal living areas.
The material of the housing consists of PMMA.

Table 2: Technical data (according to manufacturer)

Electrical connection  
Voltage 220-240 V
Frequency 0/50/60 Hz
Performance 31 W
Dimension and weight  
Width/length 92 mm/1.110 mm
Height 90 mm
Weight 2.310 g
Additional technical data  
Number of LED modules 2
Housing material PMMA
Colour temperature 4000 K
Dimmable yes
Light angle Wide Beam
Light yield 149 lm/W

The Method

Resistance to ammonia

The ammonia resistance of the moisture-proof diffuser luminaire AMPHIBIA PM was determined by a laboratory test with one luminaire according to the patented DLG test standard for agricultural use. The laboratory test is designed to replicate the conditions of a usage period of about 10 years exposure to animal living areas.

The test was carried out in a climate chamber under the following climate conditions:

Test duration 1500 h
Air temperature 70 °C
Relative humidity 70  %
Ammonia concentration 750 ppm

For assessing the ammonia resistance, each luminaire was examined visually, gravimetrically and the plastic parts additionally through measurement of the hardness (Shore D) before and after the climate testing. Since 2017, luminaires have additionally been following a cycle o f operation predefined by DLG (3 hours on, 1 hour off) in order to eveluate any thermal impacts caused by switch-on and -off procedures during ammonia fumigation.

In order to avoid overheating (> 70 °C), the luminaires could be operated at a reduced power level during the testing period.

For all test procedures, the moisture-proof diffuser luminaire “AMPHIBIA AMP S 4600-840 PM WB EVG, 1.1 m long” has been used. After the tests, the luminaires underwent visual examination to a reference sample that was identical in construction.

The Test Results in Detail

Resistance to ammonia

Visual test

The comparative visual examination after the ammonia exposure has shown minor discolorations at the inside of the luminaire housing. There were few discolorations on the outside of the housing. The deformation at the housing kept within limits. It cannot be ruled out that a limited ammount of ammonium compounds might enter the luminaire housing. Also in this case, no negative impact on the luminaire performance needs to be expected. The defects are rated as insignificant.

Gravimetric test

Weight comparisions before and after the ammonia fumigation have not shown any measurable increases
or decreases in weight.

Hardness test

During the hardness test (Shore D) no measurable changes were observed. All determined changes were within the measurement incertainty.

Functional test

No defects were observed. All luminaires worked well after the conducted tests.


The results show that the moisture-proof diffuser luminaire AMPHIBIA PM fulfills the testing requirements for ammonia resistance (evaluation “◯” or better) and thus receives the test mark DLG-Approved. It can be expected that the luminaire is resistant to ammoniacal air in barns and stables and that no accelerated reduction of the product lifetime occurs.

The moisture-proof diffuser luminaire AMPHIBIA PM was operated both passively and actively during the ammonia fumigation in the test chamber and passed both tests successfully. Other critera have not been assessed.

Applicant and Test implementation

Manufacturer and applicant

Manufacturer and Applicant
Zumtobel Lighting GmbH
Schweizer Strasse 30
6851 Dornbirn

Phone +43 (0)5572 390-0 

Test implementation

DLG TestService GmbH, Gross-Umstadt location
The tests are conducted on behalf of DLG e.V.

DLG test framework
DLG-Approved Test “Ammonia resistance”
(current as of 10/2017)

Indoor operations

Head of Department
Dipl-Ing (FH) Tommy Pfeifer 

Test engineer(s)
Dr. Ulrich Rubenschuh *

*    Author


DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 64823 Groß-Umstadt Germany • Tel.: +49(0)69 24 788-611 •