Are sun rays measurable in weight?

Question

if the plants absorb the sun rays will the earth gain weight or mass by collecting them over millions of years?

Answer 1

The plants gain weight from the air and from water... not from light.

Answer 2

Light is made of photons, and photons are said to not have mass, so no weight.

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In physics, the photon is the elementary particle responsible for electromagnetic phenomena. It is the carrier of electromagnetic radiation of all wavelengths, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. The photon differs from many other elementary particles, such as the electron and the quark, in that it has zero rest mass; therefore, it travels (in a vacuum) at the speed of light, c.

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http://en.wikipedia.org/wiki/Photon