{"product_id":"osram-vialox-nav-t-hps-lamp","title":"Osram Vialox NAV-T HPS Lamp – SON-T Grow Light Bulb","description":"\u003ch2\u003eHigh-Output Sodium Light for Strong Flowering and Fruiting\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOsram Vialox NAV-T HPS Lamp\u003c\/strong\u003e is Osram's clear tubular \u003cstrong\u003ehigh-pressure sodium\u003c\/strong\u003e lamp, giving a warm, red-rich light of around \u003cstrong\u003e2000K\u003c\/strong\u003e – the part of the spectrum that drives \u003cstrong\u003eflowering and fruiting\u003c\/strong\u003e – on a standard \u003cstrong\u003eE40\u003c\/strong\u003e cap that fits any E40 HPS lamp holder. The \u003cstrong\u003e400W\u003c\/strong\u003e and \u003cstrong\u003e600W\u003c\/strong\u003e lamps are Osram's higher-output \u003cstrong\u003eNAV-T SUPER 4Y\u003c\/strong\u003e, sold on the box as \u003cstrong\u003eSON-T PLUS\u003c\/strong\u003e: Osram rate them at \u003cstrong\u003e56,500\u003c\/strong\u003e and \u003cstrong\u003e90,000 lumens\u003c\/strong\u003e (up to \u003cstrong\u003e150 lm\/W\u003c\/strong\u003e) with a \u003cstrong\u003e32,000-hour\u003c\/strong\u003e life. The \u003cstrong\u003e1000W\u003c\/strong\u003e is Osram's standard \u003cstrong\u003eVIALOX NAV-T (SON-T)\u003c\/strong\u003e, rated at \u003cstrong\u003e130,000 lumens\u003c\/strong\u003e. Choose the wattage that matches your ballast.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSON-T PLUS output at 400W and 600W\u003c\/strong\u003e – the higher-output Super 4Y version of Osram's Vialox sodium lamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 150 lm\/W\u003c\/strong\u003e on the 600W for strong canopy intensity from every watt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed-rich 2000K spectrum\u003c\/strong\u003e suited to flowering and fruiting crops\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4Y long-life rating\u003c\/strong\u003e on the 400W and 600W – Osram rate them at \u003cstrong\u003e32,000 hours\u003c\/strong\u003e, still giving \u003cstrong\u003e94%\u003c\/strong\u003e of their light at 12,000 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard E40 cap\u003c\/strong\u003e – fits common HPS reflectors and lamp holders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree wattages\u003c\/strong\u003e – 400W, 600W and 1000W to match the ballast you run\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Is My Flowering Weaker Than It Used to Be?\u003c\/h3\u003e\n\u003cp\u003eMost HPS lamps never actually blow; they simply lose output month by month. The decline is gradual and easy to miss, but plants notice it: \u003cstrong\u003eslower growth\u003c\/strong\u003e, \u003cstrong\u003eexcessive stretch\u003c\/strong\u003e as they reach for light, and lighter flowering and smaller fruit in a room where the feed and climate have not changed. Relamping with a high-output sodium lamp brings \u003cstrong\u003elight intensity\u003c\/strong\u003e at the canopy back to where it should be, and running it on a ballast of the same wattage means it delivers its full rated output.\u003c\/p\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatch the wattage:\u003c\/strong\u003e run the 400W lamp on a 400W ballast, the 600W on a 600W ballast and the 1000W on a 1000W ballast – magnetic or digital\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCool down first:\u003c\/strong\u003e switch off and let the old lamp cool fully before you remove it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeep the glass clean:\u003c\/strong\u003e hold the lamp by its cap or wear clean gloves, then screw it firmly into the E40 holder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet the height:\u003c\/strong\u003e start higher over young plants and lower gradually, using a PAR meter or the leaves as your guide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelamp on a schedule:\u003c\/strong\u003e most growers replace HPS lamps every 9 to 12 months of grow-room use, before output has visibly faded\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Osram (Vialox range)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e VIALOX NAV-T SUPER 4Y (SON-T PLUS) at 400W and 600W; VIALOX NAV-T (SON-T) at 1000W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e high-pressure sodium (HPS), clear tubular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWattages:\u003c\/strong\u003e 400W, 600W, 1000W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCap:\u003c\/strong\u003e E40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour temperature:\u003c\/strong\u003e approx. 2000K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight output (Osram):\u003c\/strong\u003e 56,500 lm (400W), 90,000 lm (600W), 130,000 lm (1000W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficacy (Osram):\u003c\/strong\u003e 141 lm\/W (400W), 150 lm\/W (600W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated life (Osram):\u003c\/strong\u003e 32,000 hours (400W and 600W Super 4Y), 20,000 hours (1000W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBallast:\u003c\/strong\u003e standard magnetic or digital HPS ballast of the same wattage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLamp size (Osram):\u003c\/strong\u003e 28.5 cm long x 4.7 cm diameter (400W and 600W); 36 cm long x 6.6 cm diameter (1000W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest stage:\u003c\/strong\u003e flowering and fruiting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eWill it fit my reflector and ballast?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe E40 cap fits any standard E40 HPS reflector or lamp holder. Run it on a ballast rated for the same wattage; on a dimmable digital ballast, set the ballast to the lamp's wattage. The 1000W lamp is longer and wider, at 36 cm, so use a reflector made for 1000W lamps.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eIs the NAV-T Super the same as SON-T Plus?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. Osram print '(SON-T PLUS)' on the Super 4Y box – it is the higher-output, longer-life version of their standard Vialox NAV-T. The 400W and 600W here are the Super 4Y; the 1000W is the standard NAV-T (SON-T).\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eWhich wattage do I need?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe one your ballast is built for: a 400W lamp on a 400W ballast, 600W on 600W and 1000W on 1000W. A bigger lamp lights a bigger area, but it also needs more height above the plants and stronger extraction to carry the extra heat away.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I use it for vegetative growth?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eIt will grow plants through every stage, but its red-rich 2000K light is at its best in flowering and fruiting; many growers use a metal halide or LED for vegetative growth.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWorks Well With\u003c\/h3\u003e\n\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/omega-black-600w-ballast\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/600w_Omega_Black.webp?v=1752063953\u0026amp;width=160\" alt=\"Omega Black 600W Ballast\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eOmega Black 600W Ballast\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eDigital ballast to run the 600W lamp\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/eurowing-reflector-e40-with-5m-lead\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/reflector-eurowing-reflector-e40-with-5m-lead-29227631902904.webp?v=1783873812\u0026amp;width=160\" alt=\"Eurowing E40 Reflector\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eEurowing E40 Reflector\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eOpen-wing E40 reflector with 5m lead\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/grow-tools-ezi-roll-light-hangers\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/Fittings-and-Hangers-medium_landscape.jpg?v=1746904678\u0026amp;width=160\" alt=\"Grow Tools Ezi-Roll Light Hangers\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eGrow Tools Ezi-Roll Light Hangers\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eAdjust the lamp height in seconds\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Osram","offers":[{"title":"400W","offer_id":53930917495050,"sku":"LGT-OSRA-002-01","price":22.9,"currency_code":"GBP","in_stock":true},{"title":"600W","offer_id":53930917527818,"sku":"LGT-OSRA-002-02","price":29.9,"currency_code":"GBP","in_stock":true},{"title":"1000W","offer_id":53930917560586,"sku":"LGT-OSRA-002-03","price":69.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/osram-vialox-nav-t-hps-lamp-1.jpg?v=1792281951","url":"https:\/\/hydrocropshop.co.uk\/products\/osram-vialox-nav-t-hps-lamp","provider":"Hydro Crop Shop","version":"1.0","type":"link"}