Yep- it will still be light at lift off time:) The MOST beautiful ones are the night launches...
spaceflightnow.com
2222 GMT (6:22 p.m. EDT)
T-minus 20 minutes and holding. The countdown has paused for a 10-minute built-in hold. Launch is scheduled for 7:38 p.m. EDT. Everything is going smoothly with the countdown and weather is still looking good.
During this built-in hold, all computer programs in Firing Room 4 of the Complex 39 Launch Control Center will be verified to ensure that the proper programs are available for the countdown; the landing convoy status will be verified and the landing sites will be checked to support an abort landing during launch today; the Inertial Measurement Unit preflight alignment will be verified completed; and preparations are made to transition the orbiter onboard computers to Major Mode 101 upon coming out of the hold. This configures the computer memory to a terminal countdown configuration.
Major Mode 101 sounds appropriate