Home / Design For All / My client recently got told “NOT” to buy LED lighting – Inside a lighting shop!

My client recently got told “NOT” to buy LED lighting – Inside a lighting shop!

by | Apr 23, 2021

So I asked Google the same question the client asked:

Client:  “I want some lights in my room…how many should I have for the right lighting effect?”

I got  1,375 Million results, many refer to some crude formula. As a curious person I followed the results for a simple kitchen I was planning…

This 4 step formula is quoted across the World on web sites: (step 5 is mine!)

Step 1: Multiply the room’s width by its depth to ascertain the square footage.(or convert this to Sq meters if you prefer)

Step 2: Multiply the square footage by 1.5 (or 2.5 for task areas like Kitchens) to give the total wattage needed in the room. For example in the kitchen below 4.2mtrs X 4.2mtrs (thus 190SqFt x 2.5 = 475 watts)

Step 3: Divide the total wattage previously calculated by your chosen bulb wattage to work out how many fittings you need. If using LEDuse their equivalent wattage in these sums.

Step 4: Spacing,Recessed downlights are generally positioned 1.5 to 2 ft. away from walls with a space of 3 to 4 feet between each light.

Using a best selling 7 watt downlight this tells me to use 19 No. (I actually cant see how to fit them all in so I used only 16 !  )”

Step 5: Throw it in the Bin

and design something you will be proud of instead.


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