Dimensions of Lab Layout

740m by 320m should do

The integrating sphere requires twice its width of space since half the sphere has to swing-out when you open it.

As for the rest of the equipment, figure out the max dimensions of whatever you might need to test and add these dimensions to each piece of equipment. This would allow enough room to access the equipment from any side when you are doing your testing.

Then make a floor plan on graph paper or electronically on your computer and use these revised dimensions to lay out your floor plan.

You might want to consider a full-wall partition in case you need to test different items at the same time and need to isolate them.

It all depends on the lab design that you choose and the length of light path you need.

There are some "tricks" possible to significantly reduce the lab footprint.

For instance, one is to have two rooms separated with centres at the spacing of your required light path. The light path only needs to be a tube (pipe) of sufficient diameter and straightness and opacity for your incident light beam to go from source to detector.

There are some functions that can be performed with the room illuminated and some that must be in the dark. I'd have the lab in two separate rooms so that office activities and integrating sphere actions can be done while the darkroom (with the necessary long light path) is performing tests.

You really do need to engage a specialist to continue this progression as you are reaching the point where actual experience and involvement are necessary. Especially things like matching your power supplies to your light sources and specification of your receiving cells.

ALSO (PLEASE READ, COULD BE VEY IMPORTANT.)

If you are checking light sources that are larger than 200mm diameter, you need to be in contact with the certification body. There are expectations on what would be regarded as a "point source" and how you would calibrate "physically accurate" standards for your lab.