Orchids...please "Light" my way!

[Graham]

Er, sorry for the slightly cheap title...my query is to do with selecting orchids in relation to lighting conditions...

The current research* I've done suggests that there are 3 different light categories for orchids:

1. Low
2. Medium
3. High

But, how do you judge this for where you live? And what bearing does this have if you decide to grow your orchids indoors or outdoors?

For example, what sort of conditions would Low light be...since everywhere gets low light (when it's night time) and everywhere gets medium light (when it's day time)...and only England doesn't get high light, because it's raining all the time! (note to the UK tourist board: "just kidding")

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Graham.