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Since digital photographs are free and can be deleted, if you have camera software that records the speed and shutter of a photo that was taken, then shoot a photo of the piece of paper (with a little description of where and when) and view the photo data. Then you have a permanent record of the light level.
Light level are exponential. That is for every change the numbers double or are halved. Sharyn your camera setting of 80 is almost the same as 100. The first meaningful difference is 50 or 200.
If you look at the chart speed doubles with each change. Less than double is not very meaningful.
Mostly Orchids are not that critical. Most orchids can live ever more than their recommended range. The numbers that are in the middle of the charts are not that different.
Take the whole chart as a loose guide.
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jerry  |