Hi,
For BLE, the output power is set to 10dBm. For BT, the output power changes between the power levels during regular operation using power control See Vol 2, Part A Ch.3 of the BT specs: http://processors.wiki.ti.com/index.php/CC256x_Forum_Guidelines_and_FAQs#Where_can_I_find_HCI_commands_specification.3F