Skip to main content


DLG-APPROVED "Resistance to ammonia"

Download printable version

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 luminaire “LED TUBULAR LIGHT” 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 luminaire “LED TUBULAR LIGHT” 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 lumiaire “LED TUBULAR LIGHT” tested here is suitable for use in animal living areas.

Table 2: Technical data (according to manufacturer)

Technical data LED TUBULAR LIGHT    
  T60A T60C T60G
Electrical connection      
Voltage   AC 100-277 V  
Frequency   50-60 Hz  
Performance 40 W   48 W
Dimension and weight      
Diameter   70 mm  
Length   1500 mm  
Weight 2 kg   4.32 kg
Additional technical data      
Number of LED modules   270 pcs  
Housing material PC PMMA GLASS
Colour temperature   4000 K  
Dimmable   no (1-10V/Dali dimming optional)  
Light angle   120°  
Light yield   6400 lm  

The Method

Resistance to ammonia

The ammonia resistance of the luminaire “LED TUBULAR LIGHT” was determined by a laboratory test
with three luminaires 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 luminaire “LED TUBULAR LIGHT, Model no. T60A, T60C, T60G, lenght 1500 mm” 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. Due to the high temperature during the DLG test the end cap of one luminaire became detached. 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. The examination of the mounting parts provided by the manufacturer didn’t show any defects.

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.

Based on the results of these tested parameters, the luminaire is evaluated as resistant to ammonia.


The results show that the luminaire “LED TUBULAR LIGHT” fulfills the testing requirements for ammonia resistance (evaluation “o” 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 luminaire “LED TUBULAR LIGHT” 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
HongKong ERVAN GROUP LIMITED/Shenzhen Ruizi Light Electricity Technology Co. Ltd,
Building 5, Yasen Innovation Park, No. 8, Chengxin Rd, Baolong Industrial Area, Longgang,
Shenzhen 518116, China

Phone +86 18603001826

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 7/2018)

Indoor operations

Head of Department
Dr. Ulrich Rubenschuh

Test engineer(s)
Dipl-Ing (FH) Tommy Pfeifer *

*    Author


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