Final answer:
Speeding up installation time is not a valid reason to follow the Invisilight procedure steps, as following this process aims to ensure signal integrity, maintain aesthetics, and comply with safety regulations.
Step-by-step explanation:
The reason that is NOT a valid reason to follow the Invisilight procedure steps during an installation is c) Speed up installation time. The Invisilight procedure is designed to ensure that an installation is done correctly with a focus on maintaining the integrity of the optical signal, adhering to aesthetic standards to keep the environment visually appealing, and complying with necessary safety regulations. Speeding up the installation time is not a primary goal of following these steps, as rushing the process could potentially compromise the other objectives, particularly signal integrity and safety.