With general illumination, you provide a certain density of lumens in a given area. But with LV lighting, you arrange the fixtures to give a customized pattern of lighting. It’s not ambient light that you’re trying to provide; it’s that customized pattern. So don’t think of LV lighting as just a lower voltage version of standard 120V and 277V lighting used for general illumination. Think of it as a highly configurable system you can use for precise illumination. With general illumination you try to reduce or eliminate shadows and uneven lighting. But with LV lighting, strategically placed shadows and uneven lighting are often desirable. Because low-voltage (LV) lighting lamps are small, so are their fixtures (usually). You have a lot more flexibility in placing LV fixtures than you do with, say, a 4×4 fluorescent fixture. You need to figure out where those fixtures should go and why. Work with the architect or end-user to determine what accents, shadows, and other lighting effects are desired and where. Note that the available fixture sizes vary depending upon the type of LV lamp. For example, you can get MR-16 in a smaller size than you can get PAR 38 (and PAR 36 gives you a slightly smaller fixture than PAR 38). It’s often an iterative process to select the LV lighting type, fixture, and lamp because the lighting output and other factors vary. You may need a mockup for the end-user or architect to review before finalizing the design.