37-578: T4 or T-4 may refer to: Airports and airlines [ edit ] Heathrow Terminal 4 Tiyas Military Airbase , also known as the T-4 Airbase Biology and medicine [ edit ] T4 phage , a bacteriophage Thyroxine (T 4 ), a form of thyroid hormone the T4 spinal nerve the fourth thoracic vertebrae of the vertebral column A non-small cell lung carcinoma staging for
74-424: A ballast for T12 will reduce lamp life and can increase energy consumption. Conversely, a T12 tube on a T8 ballast will usually draw too much power and so may burn out the ballast, unless it is within the range that particular ballast can compensate for. The tube type should always match the markings on the light fixture. F32T8/28w lighter cathodes that can only handle a lower amount of power. They will function as
111-510: A departure concourse over 1 ⁄ 3 mile (0.54 km) long. Lord King , then Chairman of British Airways , demanded that Terminal 4 be solely for the use of British Airways to fulfill the airline's ambition of hosting all its flights in one terminal (an ambition that still has not been achieved even with the opening of Terminal 5 in 2008). A similar demand was made on the North Terminal at Gatwick . Terminal 4's distance from
148-487: A fourth terminal at Heathrow Airport was granted. The new terminal was built south of the southern runway at a cost of £200 million over an 197 acres (80 ha) site. Terminal 4 was opened by the Prince and Princess of Wales on 1 April 1986. Best known for its yellow jet bridges, the terminal was initially designed as a facility for short-haul 'point-to-point' traffic, to compensate for its relatively long distance from
185-454: A further two opened in 2015. A new baggage system has also been installed. Refurbishment of the arrivals areas was completed in 2017. In 2020, all flights from Terminal 4 were suspended as a result of the COVID-19 pandemic . Consequently, rail and tube services to Terminal 4 station were withdrawn; TfL Rail services were diverted to T5. Heathrow also closed one of its runways in response to
222-615: A small tactical nuclear bomb G7e/T4 , a Falke German torpedo The Italian name for the high explosive RDX Other uses [ edit ] Great East Road , a road in Zambia T4 road (Tanzania) , a road in Tanzania Lockheed Martin's High beta fusion reactor prototype, called T4 A T4 slip, a tax return form used in income taxes in Canada Aktion T4 , Nazi Germany's mass-murder of
259-616: A space mission Sukhoi T-4 , a Soviet aircraft Tatra T4 , a 1967 Czechoslovakian tram Thaden T-4 , a 1930s American four-seat all-metal cabin monoplane Volkswagen Transporter series IV van a model of the OS T1000 train of the Oslo Metro Model T4 Cunningham experimental armored car, later the M1 Armored car Weapons and explosives [ edit ] T-4 Atomic Demolition Munition ,
296-452: A standard 40 W lamp on full-power ballasts, but may not last as long. These lamps are typically rated to last for 12,000 hours on a residential-grade ballast and only 6000 hours on a commercial-grade one. F40T12/ES In the 1990s, longer T5 tubes were designed in Europe (making it to North America in the 2000s), in addition to the shorter ones (mentioned above) already in use worldwide. Like
333-416: A technology developed by Microsoft Tekken 4 , a 2001 fighting game Rail transport [ edit ] Eastern Suburbs & Illawarra Line , a Sydney Trains railway service Île-de-France tramway Line 4 T4 (Istanbul Tram) Vehicles [ edit ] Dayton-Wright T-4 , a 1918 American light, single-seat reconnaissance aircraft Kawasaki T-4 , a Japanese aircraft Soyuz T-4 ,
370-561: A type of tumour A CD4 + T lymphocyte T4: an EEG electrode site according to the 10-20 system Entertainment [ edit ] T4 (Channel 4) , the former daytime teen-aimed slot on Channel 4 in the UK Terminator Salvation , sometimes referred to as Terminator 4 Transformers: Age of Extinction , the fourth film in the live-action Transformers film series Software and video games [ edit ] Text Template Transformation Toolkit ,
407-809: Is accessed from Junction 14 of the M25 motorway via the A3113 and then the Southern Perimeter Road. It is also accessible from Central London via the M4 , exiting at Junction 3. There is a short stay car park directly opposite the terminal and a long stay car park on the other side of the twin rivers . Terminal 4 is served by the London Underground 's Piccadilly line trains at Heathrow Terminal 4 tube station and by Elizabeth line trains at Heathrow Terminal 4 railway station . All trains between
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#1732765148244444-427: Is different from Wikidata All article disambiguation pages All disambiguation pages Heathrow Terminal 4 Heathrow Terminal 4 is an airport terminal at Heathrow Airport , the main airport serving London , England, situated to the south of the southern runway, next to the cargo terminal. It is connected to Heathrow Terminals 2 and 3 by the vehicular Heathrow Cargo Tunnel , and by rail with
481-462: Is more efficient than standard external reflectors. Another example is color matched aperture lights (with about 30° of opening) used in the food industry for robotic quality control inspection of cooked goods. Aperture lamps have a clear break in the phosphor coating, typically of 30°, to concentrate light in one direction and provide higher brightness in the beam than can be achieved by uniform phosphor coatings. Aperture lamps include reflectors over
518-576: Is served by some local buses, coach services and car parking. [REDACTED] Media related to Heathrow Terminal 4 at Wikimedia Commons 51°27′35″N 0°26′51″W / 51.45972°N 0.44750°W / 51.45972; -0.44750 Fluorescent-lamp formats Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics. In
555-927: Is the base for SkyTeam members except Aeroméxico , Delta Air Lines , Middle East Airlines , Virgin Atlantic and China Airlines (all Terminal 3 only). Three Oneworld members fly out of Terminal 4, Malaysia Airlines , Royal Air Maroc and Qatar Airways . All have joined the alliance since moving to Terminal 4. Sri Lankan Airlines formerly operated from Terminal 4 but shortly after it joined Oneworld in 2014 it transferred its flights to Terminal 3. The principal non-aligned airlines are KM Malta Airlines , China Southern Airlines , El Al , Etihad Airways , Gulf Air , Oman Air and Royal Brunei Airlines . Other non-aligned airlines are Air Algerie , Air Astana , Air Serbia , Azerbaijan Airlines , Biman Bangladesh Airlines , Bulgaria Air , Kuwait Airways , Tunisair , Uzbekistan Airlines , Vueling and WestJet . Terminal 4
592-699: Is used for blacklight-blue lamps employing a Wood's glass envelope to filter out most visible light, commonly used in nightclubs. Other non-standard designations apply for plant lights or grow lights . lamp type In the American lamp code, the F as in FxxTyy is replaced by a G as in GxxTyy, indicating that it's a germicidal lamp. This section lists the more common tube ratings for general lighting. Many more tube ratings exist, often country-specific. The Nominal Length may not exactly match any measured dimension of
629-581: The Heathrow Terminal 4 tube and Heathrow Terminal 4 railway stations . Terminal 4 was opened by the Prince and Princess of Wales on 1 April 1986. British Airways was the main airline operating from the terminal from 1986 until its move to Terminal 5 on 29 October 2009, eventually making Terminal 4 the Heathrow base for airlines of the SkyTeam airline alliance. In 1979, approval for
666-492: The Power Groove lamp. These lamps are recognizable by their large diameter ( 2 + 1 ⁄ 8 in or 54 mm) and grooved tube shape. Colors using a halophosphate formulation are usually indicated by WW for warm white, W for (neutral) white, CW for cool white, and D for the bluish daylight white. Philips and Osram use numeric color codes for tri-phosphor and multi-phosphor colors. The first digit indicates
703-505: The color rendering index (CRI) of the lamp. If the first digit on a lamp says 8 , then the CRI of that lamp will be approximately 85. The last two digits indicate the color temperature of the lamp in kelvins (K). For example, if the last two digits on a lamp say 41 , that lamp's color temperature will be 4100 K, which is a common tri-phosphor cool white fluorescent lamp. BL is used for ultraviolet lamps commonly used in bug zappers . BLB
740-706: The 1970s, 34-watt energy-saving F40T12 fluorescent lamps were intoroduced in the United States. In the 1980s, T8 32-watt lamps were introduced, but unlike the T8 tubes introduced in Europe, these T8s are not retrofits and require new matching ballasts to drive them. These ballasts were originally magnetic, but most today are electronic. The energy-saving T12 lamps are made to operate on ballasts designed for 40-watt F40T12 lamps, though some F40T12 ballasts are not be designed to operate these lamps, and can overheat if energy-saving lamps are used. Running an energy-saving T8 tube with
777-485: The CTA and design were ill-suited for British Airways' long-haul operations. Passengers had to transfer between Terminal 4 and the CTA by bus rather than by a short moving walkway (as between Terminals 1 and 3 for example) and once inside Terminal 4, the gate areas were not large enough for the 300-400 passengers waiting to board the waiting Boeing 747s . Passengers' baggage also had to make the trip by van, sometimes resulting in
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#1732765148244814-495: The European modular furniture, display cabinets, ceiling tile grids, etc. they were designed for, these are based on multiples of the 300 mm (11.8 in) " metric foot " instead of the 12 in (305 mm) imperial foot, but are all 37 mm (1.5 in) shorter to allow space for the lampholder connections within the 300 mm modular units, and for much easier insertion into and removal from troffer lights within
851-497: The Heathrow terminals are free. The Piccadilly line has up to six trains per hour (about every 10 minutes) in the direction of Cockfosters via central London. Trains to central London run via Heathrow Terminals 2 & 3 tube station . They may wait at Heathrow Terminal 4 for up to eight minutes. Although the journey takes longer, fares are much cheaper than on the Elizabeth Line and Heathrow Express services. Terminal 4
888-483: The UK, at least), some new fluorescent fittings were designed to take only the newer, retrofit tubes (the lamp holders are designed not to take T12 tubes, except for 8 ft length). The earlier T12 halophosphate tubes still remained available as spares until 2012. They fit in older fittings and some modern fittings that employ twist lock lamp holders, even though the modern fittings were not electrically designed for them. In
925-423: The United States and Canada or on a series choke without a starter in 220-240V countries. High-output lamps are brighter and are driven at a higher electric current . They have a recessed double contact (R17d) base on each end, rather than a standard bi-pin base, which prevents them from being installed into the wrong fixture. Since about the early to mid-1950s to today, General Electric has developed and improved
962-469: The United States and Canada, lamps are typically identified by a code such as FxxTyy, where F is for fluorescent, and the first number (xx) indicates either the power in watts for bi-pin lamps, length in inches for single-pin and high-output lamps, and for circular bulbs, the diameter of the circular bulb. The T indicates that the shape of the bulb is tubular, and the last number (yy) is the diameter in eighths of an inch (sometimes in millimeters, rounded up to
999-401: The airport's central terminal area (CTA). The layout of the terminal, with passenger boarding gates very close to the check-in and security halls, was designed to facilitate rapid movement of passengers through the building (a requirement for short-haul, business-focused flights). Upon opening, it boasted other innovations including the complete segregation of arriving and departing passengers and
1036-518: The drop in flights. In June 2021, Terminal 4 reopened as a terminal for passengers arriving from red-list countries only. The rail and underground station remained closed back then. On 23 February 2022, Heathrow CEO John Holland Kaye announced that Heathrow Terminal 4 was to reopen in time for the summer travel peak in July. It was later announced that the Terminal would reopen on June 14. Terminal 4
1073-565: The luggage being mislaid, although this problem was somewhat alleviated in the late 1990s by the construction of an automated transfer tunnel between the CTA and Terminal 4. Following the transfer of most of British Airways' flights to Terminal 5 during 2008, Terminal 4 underwent a £200m upgrade to enable it to accommodate 45 airlines and serve as the base for the SkyTeam airline alliance. The departures forecourt has been upgraded to reduce traffic congestion and improve security and an extended check-in area opened in late 2009. Most internal areas of
1110-486: The mentally and physically disabled Normal space in topology Version 4 of Traveller role-playing game T4, one of several fluorescent-lamp formats A tornado intensity rating on the TORRO scale SPARC T4 , a microprocessor introduced by Oracle Microelectronics in 2011 See also [ edit ] The Four T's (disambiguation) 4T (disambiguation) TTTT [REDACTED] Topics referred to by
1147-542: The nearest millimeter). Typical diameters are T12 or T38 ( 1 + 1 ⁄ 2 in or 38 mm) for larger, often less efficient lamps, T8 or T26 (1 in or 25 mm) for smaller and often energy-saving lamps, and T5 or T16 ( 5 ⁄ 8 in or 16 mm) for very small lamps, which may even operate from a battery-powered device. For T2–T12 and T17, the number indicates the tube diameter in 1 ⁄ 8 inches, e.g. T2 → 2 ⁄ 8 in and T17 → 17 ⁄ 8 in. Whereas for T16 and T26–T38,
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1184-469: The non-aperture area. Aperture lamps were commonly used in photocopiers in the 1960s and 1970s where a bank of fixed tubes was arranged to light up the image to be copied, but are rarely found nowadays. Aperture lamps can produce a concentrated beam of light suitable for edge-lit signs. Single-pin lamps (Also generically called "Slimline" in the United States) operate on an instant start ballast in
1221-463: The number indicates the approximate tube diameter in millimeters. Some lamps have an internal opaque reflector. Coverage of the reflector ranges from 120° to 310° of the lamp's circumference. Reflector lamps are used when light is only desired to be emitted in a single direction, or when an application requires the maximum amount of light. For example, these lamps can be used in tanning beds or in backlighting electronic displays. An internal reflector
1258-447: The same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=T4&oldid=1202673838 " Category : Letter–number combination disambiguation pages Hidden categories: Short description
1295-554: The terminal were renovated between 2009 and 2014, whilst a new SkyTeam Alliance passenger lounge for premium passengers opened in 2009, more recently followed by the Etihad Airways Lounge. A Malaysia Airlines Golden Lounge, Gulf Air Golden Falcon Lounge, Qatar Airways Premium Lounge and Plaza Premium Lounge have all opened since 2010. Two new stands to accommodate the Airbus A380 were constructed in 2009, and
1332-788: The tube operated at only 100 W. Increased efficiency meant that the tube produced only 9% lumen reduction for a 20% power reduction. This first energy-saving tube design remains a T12 tube even today. However, follow-on retrofit replacements for all the other original T12 tubes were T8, which helped with creating the required electrical characteristics and saving on the then new (and more expensive) polyphosphor/triphosphor coatings, and these were even more efficient. Note that because these tubes were all designed as retrofit tubes to be fitted in T12 fittings running on series ballasts on 220–240 V supplies, they could not be used in 120 V mains countries with inherently different control gear designs. Around 1980 (in
1369-429: The tube. For some tube sizes, the nominal length (in feet) is the required spacing between centers of the lighting fixtures to create a continuous run, so the tubes are a little shorter than the nominal length. In the 1970s, Thorn Lighting introduced an energy-saving 8 ft retrofit tube in Europe. Designed to run on the existing 125 W (240 V) series ballast but with a different gas fill and operating voltage,
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