This TV Samsung LC-37D7U is amazing. I looked at power usage for several settings.
TV off:
Standby
Mode 2 (TVGOS off): 16 Watts
Mode 1 (TVGOS on): 36 Watts
Mode 1 is unnecessary with TVGOS off.
Mode 2 is problematic with TVGOS on.
Backlight
TV (LC-37D7U) on:
=-8 68 Watts
=-6 82 Watts
=-4 96 Watts
=-2 108 Watts
=-0 122 Watts
=+2 139 Watts
=+4 158 Watts
=+6 177 Watts
=+8 192 Watts
TV (LC-32D7U) on:
=-6 82 Watts
=-4 96 Watts
=-2 108 Watts
=-0 122 Watts
=+2 139 Watts
=+4 158 Watts
=+6 177 Watts
=+8 192 Watts
=-8 64 Watts
=-6 74 Watts
=-4 84 Watts
=-2 93 Watts
=-0 105 Watts
=+2 117 Watts
=+4 130 Watts
=+6 143 Watts
=+8 154 Watts
-8 is used for all viewing, since it is a bedroom TV. It has more than enough brightness.
It appears this Samsung LCD uses less power than you think, if the backlight is run at lower levels.