What is the fine-grained topic of the following text: In 1992 the original lighting package was upgraded to 5 Electronic Theater Controls ETC 2.4K Sensor 96 dimmer racks with a 375 dimmer-per-circuit system, a full compliment of ETC lighting fixtures, and an ETC Obsession 1 Console. Only return the topic.
Upgrade of Theater Lighting System in 1992