how many lumens per meter for workshop?

[carpenter1]

You can use this basic calculation but it doesn’t take account of the luminaire height, also there are other factors to consider.
1. Mounting height: The lux level will change depending on the mounting height of the luminaire.
2. The type of luminaire: Floods have a 120deg spread were as Corn Lamps have 360deg.
3. Lumens per watt: lm/w vary, a Corn lamp produces 110 lm/w were as a flood may only produce 80 this will affect the amount of luminaires required.
4. The building use: This is important to know, especially for close work. You need to put light were you need it.
5. Shadows: It is difficult to eliminate all shadows. Adding two rows rather than one centre will help. You don’t want light over your back if working on a bench.
6. Building colour: wall/roof - light rather than dark colour will improve light reflection and reduce shadows.
7. Pupil lumens: This is interesting and sometimes misunderstood even dismissed by some. This is the actual lumens the eye sees rather than the lumens produced by the luminaire. Each luminaire has a correction factor to allow for this.

How high would you want to site your luminaires and what is building purpose? Do you have a preference of the type of luminaire - Floodlight, Corn lamp, LED Tube, etc.

its for the work shop, which is 40ft wide 45ft long, and 5.5m to ridge
no preference to type