Violet is when power is supressed
Light blue is full power
A-type Super Saiyan is only possible for Broly when the control crown on his forehead is worn while being under his father Paragus' control.
This unnatural super saiyan form is the result of a legendary super saiyan not being able to tap into their true power due to some type of suppressant so in this scenario the suppressant on Broly is Paragus' control crown on Broly's forehead.