We are renovating our bathroom. It’s a room without windows but has a very effective fixed square skylight (50cm x 50cm approx) that has a plastic cover at ceiling height,sort of a dimpled clear cover that sits over the space but lets the light in. It does move a little on windy days. We plan to replace it with ‘Velux Sun Tunnel’. Hoping the sun tunnel will do as good or better job than the existing skylight. Any thoughts/advice would be appreciated.