Usual voltage 12 V is used and power should be at 21 W. During driving Nissan Patrol you might need fog lights sometimes. Purchase BA15S kind of base if you want to change Patrol fog lamps. With changing all fog lights in Patrol 4.2 cars made in 1992 make sure you buy original shape. Usually universal lamps won’t suit cars with motor 2.8 produced by Nissan company.
Other voltage than 12 V may tone the reflecting plates of Patrol fog-light. Capacity of simple 21 W lamps with base BA15S might be even doubled. You may find lots and lots of bulbs for Nissan Patrol to choose from.
When you install 12 V lamps in fog lights of Nissan, be careful. When buying fog bulbs for Nissan Patrol 4.2 make sure you purchase high quality products. In base BA15S producers often offer more than 21 W of real power.