How much light a Peperomia needs will depend on the type of Peperomia plant that you have. A Watermelon Peperomia may have different lighting requirements to a Peperomia Graveolens. However, most of the species do tend to have similar preferences so you can assume that Peperomias will tolerate similar levels of light but you should check for each individual species.
Many people ask are Peperomia low light plants? And although they can tolerate low light, then will also do well under brighter conditions.
Ideally a Peperomia plant needs bright light but will do well in filtered light and can even survive in lower lighting conditions. However if you notice the markings on your Peperomia fading or you’re losing leaves this could be an indication of either too much direct sunlight or too little light.
This may seem confusing but just think. Does my plant receive direct sunlight all day? If so then that’s going to be the reason rather than too little light. If your plant is sat deep in a room with a north facing window then you can assume that too little light is the problem.
A good way to give your plant access to bright light without it being sat in the sun all day is to purchase a sheer curtain. If you place your Peperomia plants by a south facing window with a sheer curtain then your plants will be able to experience the bright light from the window but be protected from the rays by the curtain.
So in answer to your question how much light does a Peperomia need? Firstly make sure you check the type of Peperomia you have but you can probably assume that it needs medium to bright light and filtered light will help it grow most effectively. They can tolerate lower light but too dim the light and you might find that you lost the patterns off your foliage.