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Topic Title: Space to Height Ratio
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Created On: 09 February 2009 03:58 PM
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 09 February 2009 03:58 PM
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swalburn

Posts: 5
Joined: 24 October 2008

Does anyone know of a formula where you can determine the distance between luminaires when you are given the SHRmax by the lighting manufacturer?

Any help would be greatly appreciated.

Thanks
 09 February 2009 04:22 PM
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OMS

Posts: 22864
Joined: 23 March 2004

Spacing Height Ratio is defined as the ratio of the distance between adjacent luminaires (centre to centre), to their height above the working plane.

If you know SHR and the height, the distance apart D is pretty straight forward. You then need to check absolute limits such as SHR (Transverse), SHR (axial) and SHR Max.

You can also use the following as a quick means check:

SHR(Nominal) = (1/Hm) x (Square root(Area/N))

Where Hm is mounting height, N is number of luminaires.

Regards

OMS

-------------------------
Let the wind blow you, across a big floor.
 10 February 2009 09:40 AM
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swalburn

Posts: 5
Joined: 24 October 2008

Thank you OMS. You mention that if you know the SHR and the height, the distance D apart is pretty straight forward. How do you calc this?
 12 February 2009 02:10 PM
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OMS

Posts: 22864
Joined: 23 March 2004

Will if you have a square fitting with a SHR nominal of 1.5:1 mounted 2m above the working plane then the maximum spacing in axial and transverse directions is:

1.5 x 2m = 3m.

If you have a linear fitting where:

SHR(ax) is 1.0:1
SHR(tr) is 1.5.1

Then (for a luminaire 2m above the working plane) the fittings should be 1 x 2m = 2m apart end to end and each row can be 1.5 x 2 = 3m apart. Finally check that any SHR(max) value is not exceeded in either direction.

Regards

OMS

-------------------------
Let the wind blow you, across a big floor.
 11 August 2011 02:45 AM
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zjlight

Posts: 1
Joined: 11 August 2011

Hi OMS,"Space to Mounting Height Ratio"what mean?
Thanks
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