TKOF ABORTED WHEN PIC NOTES OPEN CARGO DOOR LIGHT ON TKOF PROC EXPEDITED TKOF TKOF RUN.

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WE WERE WORKING FLT IN MLG FROM LANSING TO DAYTON. THE L ENG WAS STARTED AT THE GATE AND WHILE I STARTED THE R ENG THE CAPT BEGAN TAXIING TO RWY 28. AFTER SECOND ENG WAS STARTED I READ THE AFTER START CHKLIST VERY QUICKLY AND NOTICED COCKPIT DOOR WAS UNLOCKED. I SLID MY SEAT BACK AND LOCKED DOOR. I MISSED THE CARGO DOOR OPEN LIGHTS ON OVERHEAD AND WAS JUST LISTENING FOR PROPER RESPONSE. I FINISHED BEFORE TKOF CHK AND MADE TKOF ANNOUNCEMENT THEN IMMEDIATELY CALLED TWR. WE WERE CLRED FOR TKOF. THE CAPT ADVANCED THROTTLES AND SAID 'YOUR TKOF'. I ADVANCED THROTTLES TO THE PWR AS WE LINED UP ON RWY HDG. CAPT REACHED UP TO TURN ANTI SKID ON AND CAUGHT CARGO DOOR LIGHTS ON AND ADVISED ME TO 'STOP'. WE STOPPED ON RWY AND COULDN'T EXIT ABEAM TWR DUE TO TAXIWAY CONSTRUCTION. WE DID TAXI BACK DOWN RWY AND NOTICED 7 BAGS ON RWY. CAPT NOTIFIED TWR WE HAD TO STOP AND RETURN TO GATE BECAUSE OF DOOR OPEN LIGHTS. TWR REPLIED; 'WE KNOW. WE HAVE BEEN WATCHING YOU THE WHOLE TIME AND HAVE YOU ON VIDEO TAPE'. WE RETURNED TO GATE; LOADED BAGS AND CONTINUED TO DAY. I SHOULD HAVE SEEN LIGHTS ON BUT I WAS OCCUPIED BY COCKPIT DOOR AND ANNOUNCEMENTS. ALSO; ACFT HAS UNUSUALLY DIM ANNUNCIATOR PANEL AND SUNLIGHT WAS SHINING DIRECTLY ON PANEL. EVEN AFTER BEING TOLD LIGHTS WERE ON; THEY WERE DIFFICULT TO SEE. I WILL NOT LET ANYONE RUSH ME FROM NOW ON! SUPPLEMENTAL INFO FROM ACN 189653: I FEEL THAT I RUSHED THE OP IN ORDER TO BE FIRST IN THE BANK OF ARRS AT DEST ARPT IN ORDER TO AVOID THE USUAL DELAY BECAUSE OF HVY TFC DEMANDS AT BANK TIMES.