You might be confusing in-game with testing in Studio. The Future lighting technology is not enabled to display in live games except for a very limited number of whitelisted games used by Roblox for testing. Your game is not an exception to the new lighting not yet being rolled out, and thus the beta lighting features are not displayed in your live game.
Please keep an eye on the announcement topic for when this changes, once Roblox fully releases phase 3 to the public; Future Is Bright: Phase 3 - Studio Beta