Multiple lights in one tent

No there aren't any negatives to more light unless your VPD is off if your temp and humidity is on point and soil temp which usually is ok unless you have cold cement floors, you can walk as much light to your plants as they want...You can check and see with Dr Bugbee and YouTube and he will explain, your PPFD can be as high as you want so long as your key factors are on point...You need to download VPD buddy and it will show you were you need to be for temp and humidity for what stage you're in.Best of luck