EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT The Genlyte Group Incorporated does business under the names of Bronzelite, Crescent, Diamond F, ExceLine, Forecast, Genlyte Controls, Hadco, Lightolier, Stonco, and Wide-Lite. Genlyte has the following subsidiaries: 1. Canlyte, Inc., a Canadian Corporation. Canlyte does business under the names of Keene-Widelite, Lightolier, Prodel, Stonco and CFI (Canadian Fluorescent Industries). 2. Diaman-Mexo, S.A. de C.V., a Mexican Corporation. 3. Lightolier de Mexico, S.A. de C.V., a Mexican Corporation.