It depends on the size and setup of your garden and the kind of reflector you are using. As a general rule, the smaller the garden, the more light misses the target and instead illuminates the walls or surrounding area. In a larger garden, side light reaches additional plants. Reflectors also differ in the way they direct light. Some create a more concentrated beam while others diffuse it over a larger area. Reflectors that diffuse it lose more light in small gardens.
In a single-light garden, reflective surfaces can increase the light getting to the garden by 50 percent or more. In a four-light garden, I tested light with and without reflectors made of Mylar stretched on a scaffold. The amount of light reaching the garden increased by more than 30 percent.
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