These are great things for bringing cheap natural light to a dark place in a house. Thus saving money on running a light in that dark spot during the day.

Most use mirrors to reflect the light and a few use fiber optic plastic cables. Either way, much of the suns intensity is lost.

I would not doubt it would outperform CFL's but that's not saying much when looking at the cost of this cool device.
Vancefish Reviewed by Vancefish on . Solar Tubes Hey has anyone ever used a solar tube or similar device for an indoor grow or have any input on how that might work out? Solatube, 160DS (10" Series) Brighten Up Kit (150-200 Square Foot Coverage) :: Solar Tube Skylights : Tubular Skylights :: Store :: ECO BUILDING PRODUCTS Rating: 5