{"product_id":"gruotvszak-hps-1000w-grow-light-bulb-e39-2-pack-red-enhanced-bloom-1950-μmol-s-136-000-lm","title":"GRUOTVSZAK HPS 1000W Grow Light Bulb E39 2-Pack — Red-Enhanced Bloom, 1950 μmol\/s, 136,000 lm","description":"\u003cp\u003e\u003cstrong\u003eThe GRUOTVSZAK HPS 1000W E39 grow light bulb is a high-output sodium lamp designed to boost flowering with a red-focused PAR spike, delivering 1950 μmol\/s and 136,000 lumens in a 2-pack.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis twin-pack of high pressure sodium (HPS) bulbs is built for indoor horticulture during the bloom phase, prioritizing red-spectrum photons to encourage denser flowering. Each lamp uses an E39 medium mogul base for broad compatibility with common horticultural fixtures and works with both electronic and magnetic ballasts. The bulbs combine intense light output with long rated life and stable lumen maintenance that keep light levels consistent across runs.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this bulb improve flowering compared with standard HPS lamps?\u003c\/h3\u003e\n\u003cp\u003eThese bulbs concentrate a larger portion of output into the red PAR region, which is typically more effective for flowering-stage photosynthesis. That red emphasis helps plants allocate energy toward bud and flower development rather than vegetative growth.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e60% greater PAR emphasis on red spectrum compared to conventional HPS\u003c\/li\u003e\n  \u003cli\u003e1950 μmol\/s high photon flux for strong canopy penetration\u003c\/li\u003e\n  \u003cli\u003e136,000 lumens total brightness for dense light coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance and lifespan can I expect in a commercial or hobby setup?\u003c\/h3\u003e\n\u003cp\u003eEach bulb is rated for a long service life with robust lumen maintenance so you won’t see sharp declines in output early in the lifespan. The design targets over 24,000 hours total life, with about 90% of initial output retained through the first 5,000 hours for predictable results during long runs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOver 24,000 hours rated lifetime\u003c\/li\u003e\n  \u003cli\u003eApproximately 90% output maintenance at 5,000 hours\u003c\/li\u003e\n  \u003cli\u003eReliable brightness retention for multi-cycle use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this bulb easy to integrate with existing fixtures and ballasts?\u003c\/h3\u003e\n\u003cp\u003eYes — the lamps use a standard E39 mogul screw base that fits most commercial grow fixtures. They are compatible with both electronic and magnetic ballast types, giving flexibility when upgrading or expanding lighting arrays.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eE39 base fits common horticultural sockets\u003c\/li\u003e\n  \u003cli\u003eWorks with electronic and magnetic ballasts\u003c\/li\u003e\n  \u003cli\u003eAllow 5 minutes to reach full brightness; wait 7 minutes before restrike\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I plan mounting, warm-up, and safety for these high-output bulbs?\u003c\/h3\u003e\n\u003cp\u003eBecause these are high-intensity sodium lamps, maintain appropriate distance from plant canopy and use rated fixtures and ballast gear. Allow the bulb to warm up for a few minutes to reach full output and follow manufacturer re-strike guidance to prolong lamp life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWarm up ~5 minutes to reach peak brightness\u003c\/li\u003e\n  \u003cli\u003eWait at least 7 minutes before switching back on after shutdown\u003c\/li\u003e\n  \u003cli\u003eUse rated fixtures, proper ventilation, and heat management\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The GRUOTVSZAK HPS 1000W E39 2-pack targets growers who need intense, red-leaning light for the flowering stage — from serious hobbyists running a few tents to commercial cultivators scaling larger rooms. Choose these bulbs if you want high photon flux (1950 μmol\/s), exceptional lumen output (136,000 lm), and long operating life with compatibility across common ballasts and mogul fixtures. They are ideal for anyone looking to convert vegetative canopy into heavier bloom production while maintaining predictable light levels over extended use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these bulbs compatible with my ballast?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the GRUOTVSZAK 1000W HPS bulbs work with both electronic and magnetic ballasts and use an E39 mogul base.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long until the bulb reaches full brightness?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Expect about five minutes to reach full output and wait at least seven minutes before restriking after shutdown.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GRUOTVSZAK","offers":[{"title":"Default Title","offer_id":56835211755860,"sku":"B0CW329GK5","price":109.29,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/gruotvszak-front-packaging.jpg?v=1787055734","url":"https:\/\/gardenluxe.co.uk\/products\/gruotvszak-hps-1000w-grow-light-bulb-e39-2-pack-red-enhanced-bloom-1950-%ce%bcmol-s-136-000-lm","provider":"Gardenluxe Uk","version":"1.0","type":"link"}