Philips 40PFL8664H User Manual page 123

4.1.4 Ambilight
In the Ambilight menu, you can adjust all Ambilight
settings individually.
Close the user manual and press h > Setup > Ambilight.
Use w or x, u or v to select and adjust a setting.
Press OK to activate a setting.
For more on Ambilight, read Use your TV > Use Ambilight.