{"product_id":"osram-plantastar-hps-lamp","title":"Osram Plantastar HPS Lamp – Grow Light Bulb for Flowering","description":"\u003ch2\u003eProfessional Sodium Light for Strong Growth and Heavy Flowering\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eOsram Plantastar HPS Lamp\u003c\/strong\u003e is a clear tubular \u003cstrong\u003ehigh-pressure sodium\u003c\/strong\u003e lamp from Osram's horticultural range, built for greenhouse and indoor growing. It comes as a \u003cstrong\u003e400W, 230V\u003c\/strong\u003e lamp for standard 400W ballasts, rated by Osram at \u003cstrong\u003e56,500 lumens\u003c\/strong\u003e and \u003cstrong\u003e725 µmol\/s\u003c\/strong\u003e, and a \u003cstrong\u003e600W, 400V\u003c\/strong\u003e lamp rated at \u003cstrong\u003e86,500 lumens\u003c\/strong\u003e, both on a standard \u003cstrong\u003eE40\u003c\/strong\u003e screw cap. The spectrum is tuned for photosynthesis rather than street lighting, and Osram rate both lamps to keep over \u003cstrong\u003e90% of their photon flux after 12,000 hours\u003c\/strong\u003e, so light levels at the canopy stay where you set them through many cycles. The 600W version is made for \u003cstrong\u003e400V gear\u003c\/strong\u003e – the ballasts and professional greenhouse fittings that run a 600W lamp from a 400V supply – and both suit \u003cstrong\u003eflowering and fruiting\u003c\/strong\u003e crops in a grow tent, grow room or greenhouse.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e400W and 600W horticultural HPS\u003c\/strong\u003e – Osram's Plantastar lamp, designed for plant growth rather than street lighting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e56,500 lumens at 400W and 86,500 lumens at 600W\u003c\/strong\u003e (about \u003cstrong\u003e141 and 138 lm\/W\u003c\/strong\u003e) for strong canopy intensity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver 90% photon flux maintained at 12,000 hours\u003c\/strong\u003e – slow, even ageing and fewer lamp changes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo supply versions\u003c\/strong\u003e – the 400W runs on standard 230V HPS ballasts, the 600W on 400V ballasts and professional fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust ceramic arc tube\u003c\/strong\u003e in a compact clear tubular envelope \u003cstrong\u003e28.5 cm\u003c\/strong\u003e long, on a standard \u003cstrong\u003eE40\u003c\/strong\u003e cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Hidden Cost of a Tired Lamp\u003c\/h3\u003e\n\u003cp\u003eAn HPS lamp rarely fails outright; it fades. As output drops the canopy receives less light, and the signs creep in slowly: \u003cstrong\u003eslower growth\u003c\/strong\u003e, \u003cstrong\u003eexcessive stretch\u003c\/strong\u003e between nodes and lighter flowering in a room where nothing else has changed. A lamp that keeps its photon output for longer holds \u003cstrong\u003elight intensity\u003c\/strong\u003e steady through the season, and matching the lamp voltage to the ballast makes sure you get the full rated output and life rather than a lamp that runs dim or fails early.\u003c\/p\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the gear first:\u003c\/strong\u003e fit the \u003cstrong\u003e400W, 230V\u003c\/strong\u003e lamp to a standard 400W HPS ballast, and the \u003cstrong\u003e600W, 400V\u003c\/strong\u003e lamp only to a ballast or fixture rated to run a 600W lamp at 400V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower off and cool down:\u003c\/strong\u003e isolate the light and let the old lamp cool fully before removing it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandle with care:\u003c\/strong\u003e hold the lamp by its cap or wear clean gloves, and screw it firmly into the E40 holder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHang at the right height:\u003c\/strong\u003e start high over young plants and lower gradually, using a PAR meter or the leaves as your guide – the area lit well depends on your reflector and hanging height\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelamp on a schedule:\u003c\/strong\u003e Osram recommend replacing Plantastar lamps after \u003cstrong\u003e12,000 hours\u003c\/strong\u003e for steady growth, rather than waiting for one to fail\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 (PLANTASTAR-T range)\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\u003eWattage:\u003c\/strong\u003e 400W, 600W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply voltage:\u003c\/strong\u003e 230V on the 400W (standard ballasts); 400V on the 600W (needs 400V-rated gear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCap\/base:\u003c\/strong\u003e E40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight output (Osram):\u003c\/strong\u003e 56,500 lumens (400W); 86,500 lumens (600W, 400V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficacy:\u003c\/strong\u003e approx. 141 lm\/W (400W); 138 lm\/W (600W, 400V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhoton flux (Osram):\u003c\/strong\u003e 725 µmol\/s (400W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour temperature:\u003c\/strong\u003e approx. 2000K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhoton flux maintenance:\u003c\/strong\u003e over 90% at 12,000 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLamp size:\u003c\/strong\u003e 28.5 cm long, 4.6–4.7 cm diameter (both wattages)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight centre length:\u003c\/strong\u003e 17.5 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBurning position:\u003c\/strong\u003e any\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended replacement:\u003c\/strong\u003e after 12,000 hours (Osram)\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 the 600W lamp work in my standard 600W ballast?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe 600W Plantastar sold here is the 400V version, so only if the ballast is rated to drive a 400V lamp. Most hobby magnetic and digital 600W ballasts run 230V lamps – check the ballast label or manual for 400V lamp support before fitting. The 400W Plantastar is a standard 230V lamp for 400W ballasts.\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;\"\u003eWhy does the 600W need 400V gear?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eIt is Osram's 400V Plantastar, built for ballasts and fittings that run the lamp from a 400V supply, typically in commercial greenhouses. It will not run correctly on a standard 230V 600W ballast, so check your gear before ordering.\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;\"\u003eHow often should I replace it?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eOsram rate it to keep over 90% of its photon flux at 12,000 hours and recommend replacing it at that point. Relamp sooner if PAR readings at the canopy have dropped.\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;\"\u003eYes, it will grow plants through every stage, but HPS light is strongest in the orange and red, so it 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\/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;\"\u003eE40 reflector and lead for the 400W lamp\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 \/ 230V","offer_id":53930917429514,"sku":"LGT-OSRA-001-01","price":26.7,"currency_code":"GBP","in_stock":true},{"title":"600W \/ 400V","offer_id":53930917462282,"sku":"LGT-OSRA-001-02","price":30.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/osram-plantastar-hps-lamp-400w-230v-1.jpg?v=1792281948","url":"https:\/\/hydrocropshop.co.uk\/products\/osram-plantastar-hps-lamp","provider":"Hydro Crop Shop","version":"1.0","type":"link"}