Light sunlight

Explds at 60° after 13 sec in a sealed glass tube (Ref 4). Explds spontaneously when frozen and then thawed. Compd is a violent expl, extremely sensitive to impact or friction. It Jalso explds on exposure to strong light (sunlight or diffused), or when in contact with P, As, ozone, fused alkalies, and organic matter such as turpentine rubber, but not with sugar or resins. Metals strong acids do not cause it to expld,... 

Natural light (sunlight) at the surface of the Earth contains very little UVA, as this is filtered out by the ozone layer in the upper atmosphere. 

Essential oils should be protected from the light. Sunlight causes photo-catalytic activity - that is, there are reactions that are speeded up by light. These reactions cause the essential oil to deteriorate. Artificial lights such as filament bulbs and fluorescent tubes are far less active than sunlight, but are still harmful. 

The visible and infrared sensors are fast, but are subject to many false signals from artificial light, sunlight, hot bodies and other heat producing bodies. The ultraviolet (UV) sensor is fast in response and is affected by few extraneous signals which are controllable. The UV sensor must be the type that only responds to a narrow band of UV, from 1850 Angstroms to 2450 Angstroms. 

Wear sunglasses and avoid bright lights, sunlight, and sunlamps. 

Since most stabilizers react in more than one way and combinations of additives are required to prepare stabilized polypropylene fiber, these materials are better discussed in accord with the function they perform for polypropylene rather than the mechanism by which they function. When making fibers, stabilizers are added to polypropylene to (1) provide melt extrusion stability (2) provide long-term thermal stability at normal use temperatures and (3) provide stability to exposure to UV light (sunlight). The degree to which these stabilizers effectively accomplish their objectives without introducing other objectionable effects, such as yellowing, determines the value of the resultant fiber product. 

Electromagnetic wave hazards infrared, UV, laser, invisible light, sunlight, high intensity light, SW, MW, LW, UH, UVW. 

Certain polymers are subject to degradation by UV light (sunlight) unless formulated with carbon black or some other UV light stabilizer. Properties of the polymer to be used should be checked to determine whether or not it is resistant to UV light. 

Provitamins. These are nonvitamin substances that occur in foods which can be converted into vitamins in the body. Well-known examples of provitamins are (1) betacarotene, which is converted to vitamin A in the intestinal wall (2) 7-dehydrocholesterol in the skin, which is converted to vitamin Dj, by ultraviolet light (sunlight) (3) ergosterol of plants, which is converted to vitamin Dj, by ultraviolet light and (4) the amino acid tryptophan, which can be converted to niacin. (Because of the poor efficiency—60 mg of tryptophan is required to produce 1 mg of niacin—tryptophan is not utilized for its provitamin value.)... 

---