I received some used 5' tubes. One type is white. The other type is brown. I'm wondering whether the brown ones let enough light through for apple trees. Anybody have any experience with brown ones?
One side comment about the white tubes is that they have spent over 20 years in the sun so far, getting reused over and over again. I'm impressed by their durability against UV degradation. The brown ones were in the sun for about five years so far. I don't know if they were this dark when they were new or not.