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LED Tubular Light

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.

Other critera were not tested.

Assessment – Brief Summary

The LED Light “LED Tubular Light” from Shenzhen Tubu Tech Co., LTD 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, LED Light “LED Tubular Light” was operated actively in the chamber for the entirety of the test.

No product damage was observed here.

Table 1: Assessment in brief

Ammonia resistance++++
Preservation of the luminous flux+++++

* DLG Evaluation range: 
+++ or better = meets, exceeds or significantly exceeds the established DLG standards 
++ meets the legal requirements for marketability
- = failed 

The Product

Description and technical data

The LED Light “LED Tubular Light” tested is suitable for use in animal housings and in agricultural farm buildings.

Table 2: Technical data (according to manufacturer)

LED Tubular Light
 TBL94F-40W TBL95F-40W TBL95F-50W TBL95F-60W
Electrical connection       
Voltage   100 - 277V AC   
Frequency   50 - 60 Hz   
Performance40 W 40 W 50 W 60 W
Dimension and weight       
Length 1,152 mm   1,452 mm 
Diameter without caps   70 mm   
Weight 1.5 kg   2.0 kg 
Additional technical data       
Number of LED modules   1   
Housing material   PMMA   
Protection rating   IP67 and IP69K   
Colour temperature   4,000 K   
Dimmable   no (0-10V/Dali
dimming optional)
Beam angle   120°   
Rated luminous flux6,000 lm 6,000 lm 7,500 lm 9,000 lm
Luminous efficacy   150 lm/W   
Color rendering index (CRI)   > 80   
Ambient temperature   -20 °C ... +40°C   
Impact resistance    IK08   
Rated service life   L70 > 54,000 hrs   

The Method

Resistance to ammonia

The ammonia resistance of the LED light “771-Farmer” was determined by a laboratory test with two 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 duration1500 h
Air temperature70 °C
Relative humidity70 %
Ammonia concentration750 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.

The luminaires have additionally been following a cycle of operation predefined by DLG (3 hours on, 1 hour off) in order to evaluate any thermal impacts caused by switch-on and -off procedures during ammonia fumigation. Furthermore the luminous flux was measured according to DIN EN 13032 before and after the fumigation in order to get additional information regarding the aging process.

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 LED Light “LED Tubular Light” in the length of 1,452 mm and at an input power of 40 W 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 outside the luminaire housing, but no negative impact on the luminaire performance needs to be expected. A slight deformation of the case could have been caused by the continuous thermal load.
During the test, the luminaire appeared to be sufficiently gas-tight. Nevertheless it cannot be ruled out, that a limited amount of ammonia respectively ammonium compounds could enter the luminaire housing.

This has not been veryfied. Again, no negative impact on the luminaire performance needs to be expected. The defects are rated as insignificant. The examination of the manufacturer’s mounting parts didn’t also show any defects.

Gravimetric test
Weight comparisions before and after the ammonia fumigation have not shown any measurable increases or decreases in weight. All determined changes were within the measurement incertainity.

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 after the conducted tests.

Preservation of the luminous flux
After completion of the test the luminaire still had a luminous flux of 91.1 %.

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


The results show that the LED Light “771-Farmer” fulfills the testing requirements for ammonia resistance and cleaning distance and thus receives the test mark DLG-Approved. It can be expected that the luminaire is resistant to ammonical air in animal living areas and that no accelerated reduction of the product lifetime occurs.

The LED Light “771-Farmer“ was operated both passively and actively during the ammonia fumigation in the test chamber and passed both tests successfully.

It is also recommended in any case to keep a minimum distance of 10 cm during cleaning.

Applicant and Test implementation

Manufacturer and Applicant

Manufacturer and Applicant:
Shenzhen Tubu Tech Co., LTD
Building A, Longteng Road, Gaoqiao District, Pingdi Street, Longgang
Shenzhen, Guangdong


Phone +86 755-84615006


Testing agency

DLG TestService GmbH, Gross-Umstadt location, Germany

The tests are conducted on behalf of DLG e.V.

DLG test framework
DLG-Approved Test “Ammonia resistance”
(current as of 03/2021)


Division head
Dr. Ulrich Rubenschuh

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

Photometric laboratory
Photometrik GmbH
Einsteinstraße 24
64859 Eppertshausen

* Author


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