Bright Filtered Lights Defined for Orchids

[Ray]

Since “bright filtered light” is such a nebulous term, I think you may safely apply it to orchids. As with any plant, you just need to be observant of changes and adjust accordingly.

As to the “thick” windows, I assume you mean thermopane types, with two panes of relatively thin glass. If uncoated, they, have little impact on light reduction. Modern, Low-E coated widows can decrease the total solar flux anywhere from 30% to almost 50%.

As to a 40 year old house, do you know if they’re the original windows? The house I lived in in PA was built in 1969, but when we sold it in 2016, the windows (Low-E) were 4 years old.