Sun and the Organic Garden
Most likely, you've chosen a nice sunny space for your garden, so your challenges in this area might be more in finding a proper bit of shade for plants that don't do well in the sun's full glare. One option is to plant taller plants all around your light-sensitive crops. It's a variation on the concept of plant allies -- pairing herbs, vegetables, and other plants that for one reason or another grow better together than apart -- and it's organic all the way.