As the electrical design engineer; what is an acceptable means for me to meet the 90% controllability requirement on my drawings- for open offices? Please keep in mind this is for an open space which uses pre-made systems furniture. My scope of work ends at showing the power feeds to this furniture and I have no control whether or not individual task lights will even be installed.

In the past I've had to increase the number of overhead light switches for inboard/outboard & for very small zones. This always ends up with a massive switch bank (or multiple banks) located on a wall somewhere- which my clients never like any ways. Additionally, when fewer lights are used overall, I can only have so many switches within these open spaces any ways- which of course does not get me to the minimum 90%. As a result of this I am now also having to look at designing individual offices with multiple switches to offset this imbalance and once again bring me to the nearly 1 switch per person total.

There has to be a better way, but could someone please tell me what that way is? How can I achieve individual task lighting for systems furniture when I have no control over what task lights may or may not get installed?

Would it be acceptable to include some sort of note for the contractor to include task lights. Generally I can't (and wouldn't) specify light fixtures that are not permanently installed as this would fall under the interior designers scope of work- not my electrical design. Given this limitation I can not (and again wouldn't) show task lights of this nature on my drawings. Which this of course brings me right back to the beginning of what CAN I actually do?