Well Light is a relative term, I dont think anyone would cal the CharB light, we debated this in the CT staff forum, the M's are simply way to easy to kill from the Air and the Top armor on the Tanks in 1940 was the same ( some thicker in fact, some thiner, The Suma and the CharB had 20 to 30mm top armor,even the R35 had 12mm to 14mm top plate, German Tanks ranged from 8 to 15mm depending on the tank) than the Top armor on the Panzer IVH, this way we have a true Tank to fight in.