The Glow 40" White Umbrella gives an even, diffused lighting effect with soft 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. This simple yet elegantly designed umbrella has a black opaque cover layer, limiting the light loss that naturally occurs through its optical white viscoelastic polymer fabric material. More on the Glow Product Line Glow Umbrellas are the direct 'fast path' to light diffusion. Umbrellas are very affordable, a breeze to work with and easy to transport. Each size and material has a specialty. 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 and creating specular highlights. The Translucent Umbrella provides diffused lighting around a bright central burst. The lighting and effect can be varied by changing the distance from flashhead to umbrella. Qliq Qwip Umbrellas are like large to giant sized parabolic reflectors. 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