Shade Cloth Percentages- which is best?
 

I'm setting up a place to set my orchids for the summer :)
I've picked an area on the northeast side of the house- it will get direct sun mid-morning to early -mid afternoon. It's shaded by some trees east of the house and by the house itself in the afternoon. I know I will need to use shade cloth, but which percentage? Gardeners Supply Company lists a shade net that filters out 50%; and 3 levels of garden fabric that cut out 15% , 30%, 40%, respectively. It's shown being put directly over lettuce and such crops, but I would suspend it on poles over the orchids on a table. I have some burlap, too, but I was told on another thread that that would filter out too much.
I'm in northwestern Massachusetts- not sure of my zone.

What I would do is take a light meter reading at midday with a cloudless sky. From there decide what percentage the sun needs to be cut to get your maximum footcandles wanted.

HOLA, YO ESTOY USANDO DE COLOR BLANCO, DA BUEN RESULTADO.

SALUDOS

Gracias-
Quanto sol esta de Argentina? Que es el latitude? Aqui es aproximente 45 grados