There is careless driving and death by careless driving.Bare with me here because I am not familiar with the law on this. If convicted of drink driving you lose your licence. If you kill someone while drink driving you receive the same loss of licence but also separately be charged with murder/manslaughter? I.e the punishment for the driving offence is the same and the death is a separate but related crime?
I don't believe that you could impose different penalties for the same offense depending on the outcome. Driving without lights cannot receive a more serious penalty if it results in death. Now if you knew your lights were faulty but decided to make the journey anyway and killed someone then you would be tried for murder and rightly so.
I apologise if this is a rather naïve and simplistic view but I am no solicitor.