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Participant

Join Date: Sep 2009
Posts: 2

Required Number of Lighting Fixtures?

09/02/2009 3:05 PM

How do i calculate the required number of fixtures of a T5 six tube flouroscent lighting in a warehouse storing machineery spares of an area of 5000sqm

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Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8778
Good Answers: 376
#1

Re: Required Number of Lighting Fixtures?

09/02/2009 4:04 PM

You need either a lighting design program or the technical theory and documentation (including the information on the light and fitting) so you can work it out by hand. You would need to provide much more information if you wanted us to supply an answer as illumination engineering is a 'black art' and is actually rather complicated.

This question has been covered a number of times before on CR4. Try a search on the right hand side.

As I have said previously there are a number of good and easy to use lighting programs available on the internet for free (such as the one on the Stahl hazardous area website). Either that or you could try a consultancy or lighting design group (but I don't think that is necessary in this case).

As for your light levels, depending on your local regulations and standards, you will be needing about 80 lux if it is a live storage area (regularly accessed), or about 40 lux if it is a dead storage area (not regularly accessed).

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jack of all trades
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Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1605
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#2

Re: Required Number of Lighting Fixtures?

09/02/2009 4:58 PM

You as the designer must first decide what the lighting level will need to be in the warehouse. Then you can use then software to make it happen.

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Associate

Join Date: Aug 2009
Location: India
Posts: 25
#3

Re: Required Number of Lighting Fixtures?

09/03/2009 6:09 AM

Given below is the rough calculations to determine the no. of fixtures required :

Assumptions :

Suppose lux level required = 50 lux

Lumens output per lamp = 2000 lumens

So, total lumens output per fixture = 6 * 2000 = 12000 lumens

Utilization Factor (UF) = 0.6 & Maintenance Factor (MF) = 0.8

Calculations :

Total lumens required for the warehouse = 5000 Sq-m * 50 lux = 250000 lumens

Effective lumen output per fixture = 12000 * UF * MF = 12000*0.6*0.8 = 5760 lumens

Therefor total number of fixtures required = 25000/5760 = 44 Nos.

The above estimation is purely approximate & I suggest to use proper software for actual calution.

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Participant

Join Date: Sep 2009
Posts: 2
#4
In reply to #3

Re: Required Number of Lighting Fixtures?

09/03/2009 12:17 PM

Thanks KKK and others who contributed to this topic. It was a great help folks and will really go a long way in my planning.

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Anonymous Poster
#5

Re: Required Number of Lighting Fixtures?

09/10/2009 12:21 AM

Hi KKK,

Thanks for your explaination. How can we get the parameters for the maintenance & Utilities factor?

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