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  2. Waveguide (optics) - Wikipedia

    en.wikipedia.org/wiki/Waveguide_(optics)

    Light pipes are tubes or cylinders of solid material used to guide light a short distance. In electronics, plastic light pipes are used to guide light from LEDs on a circuit board to the user interface surface. In buildings, light pipes are used to transfer illumination from outside the building to where it is needed inside. [citation needed]

  3. Light tube - Wikipedia

    en.wikipedia.org/wiki/Light_tube

    The pipe is coated with a 99.3% specular reflective film and the distribution element at the end of the light pipe consists of a 4.6 m long diffusing radial film with an 87% visible transmittance. The light pipe introduces consistently illuminance levels ranging between 300 and 2,500 lux throughout the year at distances between 7.6 m to 10 m. [12]

  4. List of cannabis seed companies - Wikipedia

    en.wikipedia.org/wiki/List_of_cannabis_seed...

    This is an accepted version of this page This is the latest accepted revision, reviewed on 18 January 2025. This is a list of cannabis seed companies. Some of these supply only hempseed, that is, cultivars that produce low levels of THC (allowable levels are determined by local regulation). BSF Seeds Coopérative Centrale Des Producteurs De Semences De Chanvre, France, is the main supplier of ...

  5. Glow stick - Wikipedia

    en.wikipedia.org/wiki/Glow_stick

    A glow stick, also known as a light stick, chem light, light wand, light rod, and rave light, is a self-contained, short-term light-source. It consists of a translucent plastic tube containing isolated substances that, when combined, make light through chemiluminescence. The light cannot be turned off and can be used only once.

  6. Infrared lamp - Wikipedia

    en.wikipedia.org/wiki/Infrared_lamp

    Infrared lamps are also used for some night vision devices where visible light would be objectionable. Infrared lamp sources are used in certain scientific and industrial instrument for chemical analysis of liquids and gases; for example, the pollutant sulfur dioxide in air can be measured using its infrared absorption characteristics.

  7. Drug paraphernalia - Wikipedia

    en.wikipedia.org/wiki/Drug_paraphernalia

    Bongs are an example of user-specific paraphernalia, in this case for the use of cannabis. A bong (also known as a water pipe) is a filtration device generally used for smoking cannabis, tobacco, or other herbal substances. [10] Bongs have been in use by the Hmong in Laos and Thailand, as well all over Africa, for centuries. [11]

  8. Cannabis cultivation - Wikipedia

    en.wikipedia.org/wiki/Cannabis_cultivation

    Cultivation of cannabis is the production of cannabis infructescences ("buds" or "leaves"). Cultivation techniques for other purposes (such as hemp production) differ.. In the United States, all cannabis products in a regulated market must be grown in the state where they are sold because federal law continues to ban interstate cannabis sales.

  9. Infrared - Wikipedia

    en.wikipedia.org/wiki/Infrared

    Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those of red light (the longest waves in the visible spectrum ), so IR is invisible to the human eye.