I honestly admit that - while I do have a lux meter - and certainly most of us can readily purchase one from say an electronics store or ebay etc ------ I've never taken light measurements in my growing area before.
But I can certainly do that. In fact, I think I will do it, as having some quantities (eg. lux values) to share around can or will be useful.
In the past, we just basically have relative terms - such as 'low', 'medium', 'bright' ------ which don't necessarily mean a great deal when we think about it, as it's all relative and each person might have a different reference.
I agree about the condition of - orchid handling as much light as it can handle without getting damaged by heat - is probably best for growth performance - this isn't including nutrition in the plant and size of the plant, ambient temperature of growing area, air-movement etc yet. But as much a plant can handle should be based on current state of the plant (including all those aspects).
There will be uncertainties involved of course, such as just how much light for a particular plant. Some trial and error may be required - like start off medium, then build up (and knowing gradual build up allows time for hardening or toughening up, or something like that).
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