This is my interpretation of the album (UK) version. Incredible song with 
interesting chord progression.

 
[Intro]
C                 Dm    A/C#   C   G/B   Bb  A 
Baby when the lights go out
                        Dm    A/C#   C   G/B   Bb  C 
I'll show you what it's all about
Dm A Dm 

[Verse]
Dm                     A          C
I ain't sorry for the way I feel
                           Gm        Bb
I know you think I'm being insincere
         A
From the way I'm treating you
Dm                   A          C
I never wanted to be so unkind
                   Gm       Bb
The only one thing on my mind
         C
Is just kicking it with you girl

[Pre-chorus]
Bb        C              Gm
Baby it's not the way I feel, you know you must believe me
Bb        C                 D    Dsus4 D
Baby it's not part of the deal (oh no no)

[Chorus]
              Dm        A/C#
Baby when the lights go out
 C           G/B             Bb                       A
Every single word can not express, the love and tenderness
                        Dm   A/C#
I'll show you what it's all about
C                G/B             Bb                  C
Babe I swear you will succumb to me, so baby come to me

When the lights go out
Dm A Dm

(Repeat [Verse][Pre-chorus][Chorus], the rap part is the same as [Chorus])