Difference between Luminous flux Luminaire and Luminous flux Lamps

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Bushair
Posts: 18
Joined: Thu Jan 31, 2019 10:29 am

Difference between Luminous flux Luminaire and Luminous flux Lamps

Post by Bushair » Fri Feb 15, 2019 7:41 am

Hello,
I would like to know the following the Difference between the terms Luminous flux (Luminaire) and Luminous flux (Lamps). I am getting conflicting answers to this question on the web.
For instance when I use the light fixture COOPER CROUSE-HINDS NVMV NVMVSxx15xo-G34-RD70, I see the following values:
Luminous flux (Luminaire): 12344 lm
Luminous flux (Lamps): 17500 lm
Is this something to do with the light loss ratio? Please clarify. Thank you

T.Magenheimer
Posts: 1370
Joined: Thu Jul 26, 2012 10:16 am

Re: Difference between Luminous flux Luminaire and Luminous flux Lamps

Post by T.Magenheimer » Fri Feb 15, 2019 8:01 am

Dear Bushair,

The following points should answer your question about how the two luminous flux for the lamp and the luminaire are calculated:

• The lamp and the gear is taken out of the luminaire and the luminous flux of the bare lamp is measured.
• The lamp and the gear is mounted in the fixture and the luminous intensity distribution of the fixture is measured. This measurement also gives a luminous flux of the luminaire.
• As normally (but not always) there is less light coming out of a fixture than it comes from the bare lamp, the luminous flux of the fixture is lower:
Light Output Ratio (LOR) [%] = luminous flux of the luminaire / luminous flux of the lamp


Best regards,
Your DIAL Support Team

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