What is the best way to get additional light into my house?
As per the insulation there are a number of different options here depending on site specific issues. For roofs which aren’t lined (don’t have a ceiling), the most common for of natural light is achieved by using either fiberglass or polycarbonate sheeting. Once again, each of these have their pro’s and con’s and it is recommended that you make your own mind up as to your preference. Links are below. For roofs that are lined (have a ceiling), the most common option is to install a skylight. Once again they take many forms and shapes and vary depending on the supplier. Below is a link to the two main suppliers of skylights for you to suggest which option is better suited for your application.
