Fix Deferred Lighting Showing No Visible Change

You activated the pack but the world looks like plain Minecraft. Work through these checks in order.

Check your setup

1. Game edition: The shader currently only works in Minecraft Preview/Beta, not the regular release. If you're on the normal game, the deferred rendering it needs isn't available.

2. Experimental toggle: Edit the world, open Experiments, and confirm Render Dragon Features for Creators is on. The toggle belongs to each world, so a new world or a copied world may not have it.

3. New rendering technology: In Settings → Video, make sure the option that enables the new rendering technology is switched on.

4. Pack is active: In the world's Resource Packs, the shader should be in the active list, not just the available list. If you stack several packs, try moving Deferred Lighting to the top so another pack isn't overriding it.

Check your hardware

The pack's lighting effects depend on your device's GPU. On a capable, modern GPU (such as an NVIDIA RTX-series card or similar hardware), you should see the intended effect. On other devices, the pack may show no visible change from vanilla. That is expected on unsupported hardware and is not an installation mistake. If every item above is correct and nothing changes, your device most likely can't render the effect. Reinstalling won't fix it.