Paired landing lights, such as shown on the left wing leading edge in your photo, are common. If one bulb burns out, the other will still illuminate a night landing. The paired lights may have been standard, rather than a mod. I don't see the other two in your photos. Those wings do have the Micro Vortex Generator mod, however.

Four landing lights on a Cessna piston is a bit usual. It appears that the two extra ones are located in the wing tips of this aircraft. The larger Cessna single engine piston aircraft often have two landing lights. One is actually the taxi light and is aimed lower than the landing light.

On the Cessna 182 RG that I fly; If you turn on the landing light switch it turns on both bulbs. If you turn on the taxi light, it only turns on only one bulb.