The first thing that needs to be done for this job is measure out the area of where the lights will be installed. For In-wall installs the first measurements that needs to be made are how long of an area you need for the wall reveal. The area measured out will help determine how much of the wall reveal and lens will need to be purchased. The wall reveal is a product from Pittcon and is only sold in 12’ and 6’ pieces so knowing the measurements of the area will determine which sizes and how many pieces will need to be purchased. The narrow diffusor “Pi” lens is provided by Inspired LED and only comes in 6’ lengths which means the measurements will need to be accurate for this product as well.