Determining Light levels

[miowntime]

Can anyone tell me an easy way to gauge my light level in my grow room without buying equipment or lights?

I have northeast exposure. The strongest sum comes in the morning; it casts a clear shadow of my plants on the wall. Unfortunately this is only for my left window. The right window is in partial shade as a rooftop obscures it somewhat...

Anybody wanna take a guess as to what kind of light this may be?

I wanted to try orchids other than phals. I had decided upon a den kinganium until the question of light raised its ugly head.

Thanks for any and all advice!

Beth