In July 1935, the mechanised components, though still not fully equipped, were given a separate identity, while confusingly 4th Cavalry continued to exist, giving the false impression the armoured division was a completely new force.
In French military parlance, light troops were those that engaged in scouting and skirmishing, and the distinction traditionally applied to both cavalry and infantry arms.
A mechanized light division was therefore one designed for this role but using modern motorized and armored equipment to perform it.
Another confusion often caused by the category indication is the mistake to assume that such units were "lightly" equipped: in fact most heavy equipment was concentrated into the motorised units which represented the most powerful in the French Army.
The 1re DLM used the AMR 35 as a light skirmisher and the Somua S-35 and Hotchkiss H35 as main battle tanks, though the latter vehicle was not really suited for this role as its armament was too weak.