The Glow 40" Silver Umbrella gives an even, diffused maximum output lighting effect with strong contrast shadow definition. With much attention to detail from fabric to frame ribs, this umbrella sets the standard for portable light control for people and subjects at fantastic value. Even though it is a straightforward designed umbrella, it has a black opaque cover layer, limiting the light loss that naturally occurs through its white fabric material. The Silver Umbrella provides stronger focused lighting, along with soft shadow definition. It is especially suitable for higher light output, greater reach and bringing out details.
As with all Glow products, this umbrella comes packaged in a fitted, durable fabric pouch, which protects it during transport and storage, and will not grow hard and crack like traditional, plastic umbrella casings.
Umbrellas are like large to giant sized parabolic reflector. Parabolas are technically 'conic sections'. Take a perfect cone; slice through it down to the base, the edge of the cut is a parabola. This shape is more efficient at feathering light. The important point of the physics of photographically regarding parabolas is they have a focal point. Place light aimed at the focal point and it bounces off the entire umbrella surface at different angles, but when it leaves the umbrella, all the rays are parallel.
As a comparison, Glow soft boxes were designed to simulate window, light, sky light and north light. Umbrellas can be more compact and quicker to setup than the light bank counterpart.
Another factor in choosing light modifiers: the shape of catch lights in a portrait subject's eyes and the size of the modifier in relation to the size of the subject. The larger and closer the light is to the subject, the softer the results will be as to the transition of the highlight into the shadow. The smaller the size of the unit and the further the distance is from the light to the subject, the harder the effect will be.
The great value of Glow Umbrella, Softboxes and related light modifiers makes your choice simple - both!