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Single-photon nonlinearity effect can be greatly amplified using a thermal light meter. The change of the meter light is just induced by postselection. Large postselection probability can be obtained when the mean photon number of the thermal light is large. A similar reduction phenomenon is revealed, and the large-probability enhancement phenomenon is also found. This scheme can be realized via electromagnetically induced transparency.

In the recent years, the 3D printing technology became more affordable, being used in various fields like medicine, design, architecture, manufacturing and electronics. Using 3D printed materials has many advantages: speed, cost, design freedom, customization and sustainability. An application in which 3D printing can be used is Visible Light Communication (VLC), where the polylactic acid (PLA) material can be used as cover for the transmitter (which is typically a LED), or the receiver, in order to protect the system from various external factors. The paper investigates how transparent PLA material with various thicknesses attenuates and influences the spectral composition of the light passing through it. The reflectance spectrum is measured using a spectrometer, and the attenuation using a light meter. Based on the results, it can be determined if PLA can be used in a certain optical application, depending on the spectral composition of the involved light.

The considerations, so far as they are at present known, which control the design of a light meter for finding the relative amount of visible radiation reaching undergrowth are discussed, and two instruments designed to meet the requirements are described