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LED tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.
[1] [2] Geosmin is also responsible for the earthy taste of beetroots and a contributor to the strong scent, known as petrichor, that occurs when rain falls after a spell of dry weather or when soil is disturbed. [3] In chemical terms, geosmin is a bicyclic alcohol with formula C 12 H 22 O, a derivative of decalin.
Petrichor (/ ˈ p ɛ t r ɪ k ɔːr / PET-ri-kor) [1] is the earthy scent produced when rain falls on dry soil. The word was coined by Richard Grenfell Thomas from Ancient Greek πέτρα ( pétra ) 'rock' or πέτρος ( pétros ) 'stone' and ἰχώρ ( ikhṓr ) , the ethereal fluid that is the blood of the gods in Greek mythology .
Light transmission efficiency is greatest if the tube is short and straight. In longer, angled, or flexible tubes, part of the light intensity is lost. To minimize losses, a high reflectivity of the tube lining is crucial; manufacturers claim reflectivities of their materials, in the visible range, of up to almost 99.5 percent. [10] [11]
Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage, the tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. [7] This first energy-saving tube design remains a T12 tube even today.
The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...