+8618917996096

Dark Room Design of Goniophotometer

Publisher: 13 Apr, 2021

Goniophotometer is mainly used for measuring photometric characteristics of luminaries and light source; that is luminaries laser photometric and colorimetric value distribution in different spatial directions.

Goniophotometer should be placed to do test in dark room. Many customers concern the size of goniophotometer.

how-to-choose-the-right-goniophotometer-according-to-the-standard-lm-79-and-en13032-1

According to Energy Star IESNA-LM-79 Clause 10, For measurement of luminous intensity distribution, a sufficient photometric distance should be used –generally, more than five times of the largest dimension of the test SSL product having broad angular distributions. A longer distance may be needed for narrow beam sources.

According to CIE 121-1996 The Photometry and Goniophotometry of Luminaries, about test distance(for measurements based on the photometric distance law): The photometric test distance is the distance from the photometric centre of the luminaries to the surface of the photometer head.

Measurements of intensity should be made at a distance such that the inverse square law applies within practical limits. In general the test distance should not be less than 15 times the maximum dimension of the light emitting area of the luminaire. However, for luminaries with an approximately cosine distribution in planes passing through the long axis of the luminaire, the minimum test distance can be determined as 15 times the dimension of the light emitting area normal to the lamp axis or 5 times the dimension of the light emitting area parallel to the lamp axis. The minimum test distance to be used should be greater of these two distances.

It should be noted that in certain cases, e.g. luminaries with a very narrow beam, even a test distance ratio of fifteen may not be sufficient.

For example, Lisun LSG-1800B High Precision Rotation Luminaire Goniophotometer, we recommend the Dimension of Dark Room for Goniometric Rotating Console and Photometric Light Patch should be W3.5m*H2.5m*L8m. Operator Room for controlling cabinet, computer and printer Dimension should be no less than W3.0m*L3m. A part of customers say that our space is limited; the length can not be 8m. Please confirm the size with Lisun engineer department.

Lisun LSG-6000 Moving Detector Goniophotometer fully meets the requirements of standard LM-79 Clause 9.3.1. Room Requirements according to CIE:
A. Dark Room for Goniometric Console
Dimension: W5.0m*L5.0m*H5.9m
B. Dark Room for Photometric Light Path
Dimension: W1.5m*H1.5m*L (15m – 30m)
C. Operating Room
Dimension: no less than W3m*L3m

LISUN GROUP engineer dept will submit the Lab Design support documents according to the customer’s real lab size after the formal purchase order was confirmed.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Surge Generator, EMC Test SystemsESD Simulator, EMI Test Receiver, Electrical Safety Tester, Integrating Sphere, Temperature Chamber, Salt Spray Test, Environmental Test ChamberLED Test Instruments, CFL Test Instruments, Spectroradiometer, Waterproof Test Equipment, Plug and Switch Testing, AC and DC Power Supply.

Please feel free to contact us if you need any support.
Tech Dep: [email protected], Cell/WhatsApp: +8615317907381
Sales Dep: [email protected], Cell/WhatsApp: +8618917996096

Leave a Message

Your email address will not be published. Required fields are marked *

How to improve the accuracy of LED flux test in Sphere?

How to improve the accuracy of LED flux test in Sphere?

Abstract: According to the particularity of LED luminous flux measurement, unique optimization is adopted in the design of the integrating sphere for LED measurement combined with the diffuse materials of high reflectivity, which makes the system stability and accuracy have great improvement. The experimental results show that the system stability and consistency is much higher than other commo...

Release time: Apr, 132021 / Reading: 9 Learn more
The New Integrating Sphere Design

The New Integrating Sphere Design

Due to the LED luminaries such as LED street luminaries developed, to do 4π geometry testing, it is hard to be hold in the traditional integrating sphere design. To solve this problem, Lisun design a new kind of sphere. From today, we accept the order for this kind new integrating sphere, please note the order code is IS-*MA or IS-*MA**P. new-integrating-sphere-design 1.The hold base can bea...

Release time: Apr, 132021 / Reading: 7 Learn more