Your HV battery only has 400 watt hours of usable power.
Battery power is the issue here.

Tail-lamps / brake lamps / turn lamps are about 25w each.

Tail lamps are always on, and brake lamps would depend on if you are in stop & go or Highway.

So you have a 50 w constant draw for tail lamps, and 100w intermittant every time you hit the brake. Let's assume an average of 60w draw over an hour.

60 watt hours is 15% of your HV battery, so not insignificant, especially added up over years. Electrical draw at night = about 2 MPG loss. I am reducing that by 15%.

-John