I haven't done lighting design for decades. The lighting levels for various occupancies were mandated by the factories act.
We used the manufacturers published pattern and intensity charts to determine our lighting source values.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

Thank you for your imut waross, hope any one else has any info on the CVM method...

http://www.luisalbanes.com

I found this paper where they found an effectiviness of 90.7%:

Conclusions
The purpose of this paper was to resolve a question posed by [Abidin and Ibrahim
2004] regarding the effectiveness of a LPS based on the CVM air terminals optimally
positioned on buildings to include the competing features of the building. Toward
this end, two research objectives were addressed. The first was to use lightning
strike data from 24 buildings in Kuala Lumpur, Malaysia, that were gathered over a
two year period to estimate the extent of protection provided by CVM air terminals
optimally positioned on buildings. The second objective was to investigate the
validity of the various underlying semi-empirical theories for CVM air terminals.
Relative to the first objective, our statistical analysis of the strike data recorded
on the 24 buildings for 37 combined years of service indicated that the observed
efficiency is 90.7% with CVM air terminals optimally positioned on buildings in
Kuala Lumpur

Reference: https://arxiv.org/pdf/1602.01395.pdf

http://www.luisalbanes.com

I'm sorry. My eyes ae not what they once were. I read lightning as lighting.
I guess my post didn't make much sense.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!