Produse pentru lumina (151)

LumiLife is one of the leading names in LED trade lighting, offering products including LED panels, tube lights, floodlights and downlights that are designed to provide long-lasting illumination while helping customers save on energy costs. Watt - 15W Lumens - 3K: 1320lm, 4K: 1440lm & 6K: 1380lm Lumens per watt - 88~100 CCT - 3000/4000/6000K 220-240V AC CRI - >80 PF > 0.9 Beam angle - 120 degree Driver - 25~42V DC 350mA Base material - ABS Diffuser material - Polycarbonate Wall/Ceilings Fixings - Included IP Rating - IP65 IK Rating - IK08 Working temp - -30C to +50C Flicker free - Yes Dimensions - 325 x 325 x 100mm MICROWAVE SENSOR : Motion detector - Merrytek Detection area - 4 to 7m (100%), 3m (high) Detection angle - 150 degrees (wall), 360 (ceiling) Time on - 5 Sec, 30sec, 1 Min, 3min, 5 Min, 10 Min, 20 Min and 30 Min Lux Level - 2 Lux, 10 Lux, 25 Lux, 50 Lux or off

Eveready LED: an affordable, top-quality choice for lighting projects. Compliant with industry standards, it offers high performance and sustainability. Trusted by households worldwide. 4W / 40W Replacement 470 Lumen 2,700K (Warm White) Non-Dimmable 220-240V Energy Rating E

Experience the efficiency and affordability of Energizer® LED lights, a trusted brand for superior lighting solutions. Energizer "A" Rated lightbulbs are a wise investment for anyone looking to reduce their energy bills, minimize their environmental impact, and enjoy high-quality, reliable lighting. They offer a range of benefits that make them a superior choice over less efficient alternatives, aligning with both economic and environmental goals. "A" rated bulbs are among the most energy-efficient options available on the market today. 3.8W / 60W Replacement 806 Lumens 2,700K (Warm White) Non-Dimmable Energy Rating A 50,000hrs / 50 Year Lifespan

Duracell's 250 Lumen Aluminium LED Flashlight is your go-to choice for versatile illumination. Its lightweight, durable aircraft-grade aluminium construction ensures long-lasting reliability. With a single, powerful 250-lumen mode, it provides clear visibility up to 180 meters. Batteries are included, making it perfect for household use and emergencies. Lightweight and strong aircraft-grade aluminium makes this flashlight virtually indestructible, with a tail cap switch for easy use. Single mode: 250 lumens for 180 meters of clear visibility. 3 AAA batteries included. Ideal size for a toolbox Perfect for emergencies and around the house.

Knight Optical can offer Light Guides for use within the Cosmetics Industry. We supply a range of Light Guides for a range of applications. All individually QA checked and metrology tested for quality to ensure parts meet customer specification. Supplied in a range of sizes and shapes with custom coatings tailored to meet your individual applications. Knight Optical supply precision optical components to customers within the Cosmetics Industry. Our Light Guides are the key element in cosmetic laser, or intense pulsed light (IPL) applications. IPL is a cosmetic application commonly used for hair removal. IPL application have requirements of different wavebands and so our custom light guides are available in a choice of materials and coatings to suit your waveband requirements. For more information read PDF… Material::N-BK7 or equivalent, Sapphire and UV Fused Silica Dimensional Tolerances::+/- 0.1mm Surface quality::< 40-20 Scratch/Dig Coatings::< AR Coatings available on request

Knight Optical supply stock and custom deviation penta prisms that cover the visual and NIR range. Deviation prisms are an optical component that will redirect a light beam into another known angle relative to the incoming beam. The penta-prism is a deviation prism which is used in cameras with a movable mirror that bends the beam vertical onto the focus graticule. The penta-prism provides a 90° deviation of the beam from the focus plane and, via an eyepiece, the user can aim the camera along the same axis as the beam that is focused onto the detector, electronic or wet film. Deviations through other angles can be accomplished using, for example, abbe constant deviation, littrow, and wadsworth prisms. Read PDF for more info Material::N-BK7 or equivalent Dimensions::±0.1mm Angles::±1 arcmin Surface quality::<40-20 scratch / dig Coating::Anti Reflective and mirror coatings are available on request.

13.8W Replacement 1521 Lumens 3,000K (Warm White) Non-Dimmable Limited edition promotional 5+1 Free pack 13.8W Replacement 1521 Lumens 3,000K (Warm White) Non-Dimmable Limited edition promotional 5+1 Free pack

Linear sheet polarizers are used for a broad range of applications including the production of LCD monitors and TVs, photography and other lighting and entertainment systems such as projectors. Our UV and IR sheet polarizers extend the spectral range down to 290m for the HNP’B replacement material and HR is used between 800nm to 2000nm. We have extensive stock of HR material in 76.2mm square sheets. The range from 800-860 the HN7 type offers superior performance at a reduced price. Working below 800nm HN22 is an ideal choice. Knight Optical supply linear sheet type polarizers in a range of types. These sheet polarisers were formerly supplied by Polaroid/3M under the Vikuti brand. Although these sheets have since been made obsolete by the manufacturer, Knight Optical holds substantial stock of the original material including HN32, HN38 and HN42, and performance HN22, HN38S and HN42HE high extinction sheets Read PDF for information

Knight Optical offers a range of precision optical components for use in IPL (Intense Pulsed Light) applications. The most common usage of IPL systems are typically used as photo epilators.Custom Ceramic Reflectors are a key component for this application. The xenon flash lamp which are typically used emit light in 360 degrees. However utilising ceramic reflectors which are light reflectors with a U channel means that light which would normally be wasted i.e. shining backwards is now refocused down into the filters and light guides. Knight Optical provides ceramic reflectors which are typically moulded from alumina. This choice of material is down to its ability to withstand thermal stresses and high reflectivity values. For more information read PDF

Duracell's versatile 450-lumen headlamp is a must-have for hands-free illumination during high-intensity activities. With adjustable head straps for comfort, it offers five light modes, including spot and flood options, and boasts IPX4 water resistance. Suitable for indoor and outdoor use, it's perfect for camping, hiking, and everyday tasks, providing essential light during power outages or in dim spaces. Comes with 3 AAA batteries. IPX4 water resistance can withstand extreme weather conditions. The head strap is fully adjustable and ultra-comfortable. 5 light modes: Switch between Spot and Flood (450 lumens), Flood (200 lumens), Red Beam, Green Beam, and Red Flasher. Comes with 3 AAA batteries. Perfect for indoor and outdoor use: Camping, hiking or even at home for blackouts or everyday tasks in those dark spaces.

Intense Pulsed Light Systems use not only use filters, that are used to filter out the UV wavelength range; and transmit between 400-1200nm for use within cosmetic lasers that are designed to remove unwanted hair, vascular treatment and even acne treatment. But they also use Homogenizing Rods to help evenly distribute light. The Light source will enter a light pipe at a variety of incident angles, which is designed to utilise its total internal reflection to channel the light from the entrance of the light pipe to the exit. The material’s refractive index is the only factor which affects the light pipes critical angle; this defines the angle of acceptance which the total internal reflection will occur at. All our Homogenizing Rods are fully inspected on their quality in our ISO 9001 certified, state-of-the-art Metrology laboratory, using our Trioptic’s PrismMaster, and Starrett AV300 Video Imaging System.. FOR MORE INFORMATION READ PDF.. Length Tolerance::+/- 0.3mm Aperture Tolerance::+/-0.1mm Surface quality::<60-40 Scratch/Dig Coating::Optional

The Energizer Smart 18W Ceiling Light delivers exceptional illumination with 1836 lumens, offering energy efficiency at 102 lumens per watt. It provides a wide range of lighting options, including colour-changing RGBW and adjustable white temperature from 3000K to 6500K CCT. With a 120-degree beam angle, group control, scheduling, sleep scheduling, remote access, and voice control, this IP20-rated ceiling light is a versatile and smart lighting solution. Dimensions: 330mm (w) x 330mm (h) x 60mm (d). 18W / 102 Lumens per Watt 1840 Lumens Colour Changing - RGBW White Temperature - 3000K to 6500K CCT 120 Degree Beam Angle Group Control Scheduling / Sleep Scheduling Remote Access Voice Control IP20 Dimensions: 330mm (w) x 330mm (h) x 60mm (d)

LED Lighting Industry Colour Glass Filters as downlights within stage production - Knight Optical has successfully launched a range of Stock Colour Glass Filters, for use within Entertainment and Design Industry. Within the LED Lighting Industry, Colour Glass Filters can used as downlights within a stage production by filtering the different visible wavelengths and filter out unwanted light from a white light source to provide desired coloured light that is perceived by an audience to be a highly saturated or intense colour. This is just what you need to help set the atmosphere for whatever event you’re planning We hold a massive inventory of Bandpass, Long pass, Short pass, and Mounted Colour Glass Filters. Stock sizes of 25mm diameter; and 50x50mm squares x 1mmthk with larger sizes of 300x300mm available on most of our filters as a custom option. Custom shapes and sizes at short notice, in most cases turned around within 1-2 week. Alternative thickness substrates available. For more information read the PDF ….. Material::Schott Colour Glass Diameter Tolerance::+0.0/-0.20 mm Length/Width Tolerance::±0.20mm Thickness Tolerance: :±0.20mm Transmission::Tmax typically=95%

Ball Lenses are widely used for focusing & coupling light into & out of fibres. With the high refractive index of Sapphire (Al2O3) material, it yields a low spherical aberration that can be used in the range of UV from 200nm up to 5µm, and with it being one of the hardest materials they are resistant to damage. The key feature of ball lenses is their short back focal length allowing for precision coupling where size or space is a limiting factor in the system. Typically used in pairs, where one lens acts as collimator for the second to focus the light back into the coupled fibre. Ball Lenses are manufactured from a single substrate of glad and therefore, depending on the geometry of the input source, can focus or collimate light. Half Ball Lenses can also be used as an interchange with a full ball lens for more compact designs. Read the PDF for more information... Material::BK7 or equivalent, Sapphire, Ruby, Quartz Diameter Tolerance::±2.5 Figure (sphericity)::1λ Focal Length (@587mm)::± 0.2% (<10mm), ±2.0% (10-1000mm), ±5.0% (>1000mm) Surface quality::<40-20 Scratch/Dig Back Focal Length (mm)::0.05 up to 2.34 for stock parts Focal Length (mm)::0.345 up to 7.34 for stock parts

A very effective way of viewing fringe patterns on the surface of optical flats - Monochromatic lights have a low pressure sodium light source that emits monochromatic light in which rays have virtually the same wavelength. This light is a very effective way of viewing fringe patterns on the surface of optical flats (Newton rings) Knight Optical's standard type moonlight has a straight line engraved across the diffused screen enabling the operator to easily compare the straight lines of the component being tested thus identifying how flat the flatness is. Other options of monochromatic lights are available enhanced version and floor standing version. These lights are not supplied with the optical flat as standard however we stock a range of quartz and Zerodur optical flats with a range of flatness’s to meet your application. Monochromatic light units are suitable for the following electrical services: 220/240V, 110V and 12VDC on selected units. Contact our technical team for further information. FOR MORE INFO READ PDF…

Knight Optical offer a range of Stock Achromatic Doublet Lenses for use within Light Engines. Light engines are used for applications such as fibre optic lighting displays & in diagnostic tools like western blots & polymerase chain reaction systems. These Light Engines are typically able to produce changing colour displays. Within the light engine are a range of lenses & filters. The lenses help to homogenise and collimate the light, ensuring for a crisp high-quality beam output. Achromatic Doublets are typically used in light engine systems & correct for chromatic aberrations which exist in singlet lenses. This is when different wavelengths of light refract at different rates. The doublet lens helps to correct this by facilitating the focusing of the light to the same point. This is especially important in light engines which typically generate white light. Read PDF for more information Material::BK7, SF11 Overall Diameter Tolerance::+0/-0.10mm Focal Length Tolerance::± 1.0%

Duracell 200 Lumen LED Headlamp is your ideal choice for any handsfree application. This focusing headlamp is great for outdoors, hiking and camping.IPX4 water resistance. Batteries included IPX4 water resistance to withstand even the most extreme weather conditions. Adjustable and ultra-comfortable head strap. 3 light modes: Switch between High (200 lumens), Low (30 lumens), and Strobe. Powered by 3 AAA batteries (included). Indoor and outdoor use: Take with you for outdoor activities such as camping and hiking or use at home for blackouts and everyday tasks. IPX4 water resistance to withstand even the most extreme weather conditions. Adjustable and ultra-comfortable head strap allows you to fit it perfectly to your head for unmatched comfort and support while keeping your hands free to focus on the task at hand. 3 light modes: Switch between High (200 lumens), Low (30 lumens), and Strobe. Powered by 3 AAA batteries (included).

The Lightest Weight Mast Systems in the World - 76mm ID in 3m, 4m, 5m & 7mm - THESE MASTS ARE NOT TELESCOPIC OR SECTINAL. INSTEAD THEY USE A UNIQUE ROLLABLE COMPOSITE. TRIED AND TESTED BY THE MILITARY FOR 20+ YEARS, NOW AVAILABLE TO NON-MILITARY CUSTOMERS. THE BI-STABLE ROLLABLE COMPOSITE ENABLES THEM TO BE ROLLED UP TO THE SMALLEST PACK SIZES FOR TRANSIT, AS WELL AS MAKING THEM LIGHTWEIGHT AND VERY QUICK & EASY TO DEPLOY AND RECOVER. The System 75 masts offer unrivalled portability, being compact and lightweight with exceptionally fast deployment times, yet these double tube systems can take top loads up to 23kg. The ideal portable solution for mounting lighting or antenna when time, space and weight matter.

THESE MASTS ARE NOT SECTIONAL OR TELESCOPIC. INSTEAD THEY USE A UNIQUE ROLLABLE COMPOSITE. TRIED AND TESTED BY THE MILITARY FOR 20+ YEARS, NOW AVAILABLE TO NON-MILITARY CUSTOMERS. THE BI-STABLE ROLLABLE COMPOSITE ENABLES THEM TO BE ROLLED UP TO THE SMALLEST PACK SIZES FOR TRANSIT, AS WELL AS MAKING THEM LIGHTWEIGHT AND VERY QUICK & EASY TO DEPLOY AND RECOVER. The System 50 masts offer unrivalled portability, being compact and lightweight with exceptionally fast deployment times, yet can take top loads up to 10kg. The ideal portable solution for mounting lighting or antenna when time, space and weight matter.

QUESTI ALBERI NON SONO TELESCOPICI, INVECE UTILIZZANO UN COMPOSITO ARROTOLABILE UNICO. PROVATO E TESTATO DAI MILITARI PER OLTRE 20 ANNI, ORA DISPONIBILE PER I CLIENTI NON MILITARI. IL COMPOSITO ARROTOLABILE BI-STABILE PERMETTE DI ESSERE ARROTOLATI FINO AI DIMENSIONI PIÙ PICCOLE PER IL TRASPORTO, OLTRE A RENDERLI LEGGERI E MOLTO VELOCI E FACILI DA INSTALLARE E RECUPERARE. I montanti System 100 offrono una portabilità senza rivali, essendo compatti e leggeri con tempi di implementazione eccezionalmente rapidi, ma possono sopportare carichi massimi fino a 15 kg. La soluzione portatile ideale per il montaggio di luci o antenne quando tempo, spazio e peso contano.

les systèmes de mât les plus légers au monde - 76 mm id en 3 m, 4 m , 5 m et 7 m - CES MÂTS NE SONT NI TÉLESCOPIQUES NI SECTIONNELS. ILS SONT FABRIQUÉS DANS UN COMPOSITE ENROULABLE UNIQUE. TESTÉ ET ÉPROUVÉ PAR L’ARMÉE DEPUIS PLUS DE 20 ANS, MAINTENANT DISPONIBLE POUR LES CLIENTS CIVILS. LE COMPOSITE BI-STABLE ENROULABLE PERMET DE LES ENROULER DANS DES FORMATS ULTRA-RÉDUITS D’EMBALLAGE POUR LE TRANSPORT, LES RENDANT AINSI LÉGERS ET TRÈS RAPIDES ET FACILES À DÉPLOYER ET À REMBALLER. Les mâts System 75 offrent une portabilité inégalée, sont compacts et légers, offrent des temps de déploiement exceptionnellement rapides. Dans le même temps, ces systèmes à double tube peuvent supporter des charges supérieures allant jusqu’à 23 kg. La solution portable idéale pour le montage d’un éclairage ou d’une antenne lorsque le temps, l’espace et le poids sont des éléments à prendre en compte.

i sistemi a montante più leggeri al mondo: 50 mm di diametro interno in 2 m, 3 m - QUESTI MONTANTI NON SONO SEZIONALI O TELESCOPICI. UTILIZZANO INVECE UN ESCLUSIVO COMPOSITO ARROTOLABILE. PROVATO E TESTATO DALL'ESERCITO DA OLTRE 20 ANNI, È ORA DISPONIBILE ANCHE PER I CIVILI. IL COMPOSITO BI-STABILE ARROTOLABILE PERMETTE DI ARROTOLARLI FINO A RAGGIUNGERE LE DIMENSIONI PIÙ PICCOLE PER IL TRASPORTO, OLTRE A RENDERLI LEGGERI E MOLTO FACILI E VELOCI DA DISPIEGARE E RIPORRE. I montanti System 50 offrono una trasportabilità senza pari, essendo compatti e leggeri con tempi di dispiegamento eccezionalmente rapidi, ma possono sostenere carichi nella parte superiore fino a 10 kg. La soluzione trasportabile ideale per montare l'illuminazione o l'antenna quando tempo, spazio e peso sono importanti.

los sistemas de mástil más ligeros del mundo: 76 mm de diámetro interno en 3 m, - ESTOS MÁSTILES NO SON TELESCÓPICOS NI SECCIONALES. EN SU LUGAR, UTILIZAN UN COMPUESTO ENROLLABLE ÚNICO. PROBADO Y COMPROBADO POR MILITARES DURANTE MÁS DE 20 AÑOS Y AHORA DISPONIBLE PARA CLIENTES NO MILITARES. EL COMPUESTO ENROLLABLE BIESTABLE PERMITE ENROLLARLOS HASTA OCUPAR LOS TAMAÑOS DE PAQUETE MÁS PEQUEÑOS PARA EL TRÁNSITO, ADEMÁS DE HACERLOS LIVIANOS Y MUY RÁPIDOS Y FÁCILES DE DESPLEGAR Y RECOGER. Los mástiles System 75 ofrecen una portabilidad inigualable, son compactos y ligeros, y ofrecen tiempos de despliegue excepcionalmente cortos, pero estos sistemas de tubo doble pueden soportar cargas máximas de hasta 23 kg. La solución portátil ideal para montar luces o antenas cuando el tiempo, el espacio y el peso importan.

Unwanted hair, be gone! Knight Optical offer a range of Stock Dichroic Filters, for use within IPL Applications. Intense Pulsed Light filters are essential to IPL applicators as they are used to filter out the UV wavelength range; and transmit between 400-1200nm for use within cosmetic lasers that are designed to remove unwanted hair, vascular treatment and even acne treatment. These IPL Filters are often stacked between sapphire windows within the IPL applicator to offer a more defined wavelength spectrum when in use. Dichroic filters consist of thin film dielectric coatings on glass, and are designed to offer high transmission over a specific wavelength while reflecting all other wavelengths, having negligible absorption. The dielectric coating is perfect for high power applications, and does not show the strong fluorescence of certain glass filters. We hold a massive inventory of Bandpass, Long pass, Short pass, Band-blocking and Colour-correction filters. Diameter Tolerance::Borosilicate or equivalent, Sodalime Length/Width Tolerance: :+/- 0.25mm Wavelength Range::300nm-1200nm dependant on type Wavelength Accuracy: :+/- 5nm Thickness Tolerance: :+/-0.20mm Transmission: :Tmax=95% dependant on type and substrate

Mâts Système 100 de 8 m et 10 m - utilisant le composite enroulable bistable uni - CES MÂTS NE SONT PAS TÉLESCOPIQUES - ILS UTILISENT AU LIEU UN COMPOSITE ENROULABLE UNIQUE. ESSAYÉ ET TESTÉ PAR LES MILITAIRES DEPUIS PLUS DE 20 ANS, MAINTENANT DISPONIBLE POUR LES CLIENTS NON MILITAIRES. LE COMPOSITE ENROULABLE BI-STABLE PERMET DE LEUR ENROULER JUSQU'À LES PLUS PETITES TAILLES D'EMBALLAGE POUR LE TRANSIT, TOUT EN LES RENDANT LÉGERS ET TRÈS RAPIDE ET FACILE À DÉPLOYER ET À RÉCUPÉRER. Les mâts System 100 offrent une portabilité inégalée, étant compacts et légers avec des temps de déploiement exceptionnellement rapides, tout en pouvant supporter des charges maximales jusqu'à 15 kg. La solution portable idéale pour monter un éclairage ou une antenne lorsque le temps, l'espace et le poids comptent.

Mit zusammenrollbaren Standbeinen aus Verbundwerkstoff in den Längen 1 m, 2 m od - DIESES STATIV IST NICHT AUSZIEHBAR – STATTDESSEN VERWENDET ES EINEN EINZIGARTIGEN ZUSAMMENROLLBAREN VERBUNDWERKSTOFF. SEIT ÜBER 20 JAHREN VOM MILITÄR GENUTZT UND GETESTET, JETZT AUCH FÜR KUNDEN AUS DEM ZIVILEN BEREICH ERHÄLTLICH. Durch den einzigartigen Verbundwerkstoff können diese Stative eine Höchstlast von bis zu 115 kg tragen. Leicht, portabel, stabil – Ihre ideale mobile Lösung.

con gambe arrotolabili in composito di 1 m, 2 m o 3 m, in grado di sostenere car - QUESTO TREPPIEDE NON È TELESCOPICO, MA UTILIZZA UN ESCLUSIVO COMPOSITO ARROTOLABILE. PROVATO E TESTATO DALL'ESERCITO DA OLTRE 20 ANNI, È ORA DISPONIBILE ANCHE PER I CIVILI. Grazie all'esclusivo materiale composito, questi treppiedi possono sostenere carichi massimi fino a 115 kg. Leggero, portatile, resistente, la soluzione mobile ideale.

los sistemas de mástil más ligeros del mundo: 76 mm de diámetro interno en 3 m, - ESTOS MÁSTILES NO SON TELESCÓPICOS, SINO QUE UTILIZAN UN COMPUESTO ENROLLABLE ÚNICO. PROBADO Y COMPROBADO POR MILITARES DURANTE MÁS DE 20 AÑOS Y AHORA DISPONIBLE PARA CLIENTES NO MILITARES. EL COMPUESTO ENROLLABLE BIESTABLE PERMITE ENROLLARLOS HASTA OCUPAR LOS TAMAÑOS DE PAQUETE MÁS PEQUEÑOS PARA EL TRÁNSITO, ADEMÁS DE HACERLOS LIVIANOS Y MUY RÁPIDOS Y FÁCILES DE DESPLEGAR Y RECOGER. Los mástiles System 75 ofrecen una portabilidad inigualable, son compactos y ligeros, y ofrecen tiempos de despliegue excepcionalmente cortos, pero pueden soportar cargas máximas de hasta 11 kg. La solución portátil ideal para montar luces o antenas cuando el tiempo, el espacio y el peso importan.

avec pieds enroulables composites de 1 m, 2 m ou 3 m, capables de supporter des - CE TRÉPIED N’EST PAS TÉLESCOPIQUE - IL EST FABRIQUÉ DANS UN COMPOSITE ENROULABLE UNIQUE. TESTÉ ET ÉPROUVÉ PAR L’ARMÉE DEPUIS PLUS DE 20 ANS, MAINTENANT DISPONIBLE POUR LES CLIENTS CIVILS. Grâce à leur composite unique, ces trépieds peuvent supporter des charges supérieures allant jusqu’à 115 kg. Léger, portable, solide : votre solution idéale de mobilité.

i sistemi a montante più leggeri al mondo: 76 mm di diametro interno in 3 m, 4 m - QUESTI MONTANTI NON SONO TELESCOPICI, MA UTILIZZANO UN ESCLUSIVO COMPOSITO ARROTOLABILE. PROVATO E TESTATO DALL'ESERCITO DA OLTRE 20 ANNI, È ORA DISPONIBILE ANCHE PER I CIVILI. IL COMPOSITO BI-STABILE ARROTOLABILE PERMETTE DI ARROTOLARLI FINO A RAGGIUNGERE LE DIMENSIONI PIÙ PICCOLE PER IL TRASPORTO, OLTRE A RENDERLI LEGGERI E MOLTO FACILI E VELOCI DA DISPIEGARE E RIPORRE. I montanti System 75 offrono una trasportabilità senza pari, essendo compatti e leggeri con tempi di dispiegamento eccezionalmente rapidi, possono sostenere carichi nella parte superiore fino a 11 kg. La soluzione trasportabile ideale per montare l'illuminazione o l'antenna quando tempo, spazio e peso sono importanti.