Nehekharan light chariots follow the rules for chariots with the following exceptions:

Light chariots can be formed up into units of chariots. These units also follow the rules for fast cavalry.

Light chariots cause D3 impact hits instead of D6.

Light chariots have a Unit Strength of 3 per model (4 if ridden by a character).

Light chariots offer less protection to characters riding in them. When shooting against a character riding in a light chariot, attacks will hit the character on a 5+ instead of a 6, and a light chariot confers to the character a +1 Armour save instead of the normal +2 save.