Did I break Prime?

Transformed my 20th anniversary Prime tonight and noticed that I can't keep his matrix light on.
Is it only suppose to be clicked on and off, I can't leave it turned on? the gallery here on seibs has it permanently on, not sure if that's just a "hack" though.
Is it only suppose to be clicked on and off, I can't leave it turned on? the gallery here on seibs has it permanently on, not sure if that's just a "hack" though.