That depends on the system. If it is a 120V system you can add as many as your circuit will hold. The only systems you have to be concerned about are ones’ with a remote transformer or an integral powered transformer. Then all you have to do is make sure that you are not overloading the transformer. You can add on to some of those by reducing the wattage of the exsisting fixtures to compensate for your add on.
That depends on the system. If it is a 120V system you can add as many as your circuit will hold. The only systems you have to be concerned about are ones’ with a remote transformer or an integral powered transformer. Then all you have to do is make sure that you are not overloading the transformer. You can add on to some of those by reducing the wattage of the exsisting fixtures to compensate for your add on.
Yes, ^ what he said ^.