We have installed 2 sun tunnels in my own home. We have a bathroom that had no windows. There we installed a 10” sun tunnel and in the kitchenette we used a 14” sun tube. The transformation was amazing. At this time of the year [July] you do not need the electric lights from 5:30 am to 8:30 pm.

Getting up in the morning and enter these rooms with this natural diffused light is the way to start the day. It just puts you in a better mood. When I leave the bathroom, I automatically reach for the light switch. This will pass in time. This is the only thing I have found that is a downside. Towels are fresher. They now dry in natural sunlight, instead of the dark. 

These rooms are just cheerer places now.  Time has taken its affects on my eyes. It is easier for me to read outside. Since we have brought the natural daylight inside,  I see everything clearer.

Cutting your electric use with a sun tunnel or skylight, is not worth as much as seeing and feeling better in these rooms.