--- product_id: 48923580 title: "Sylvania 400W Grolux HPS Lamp" brand: "sylvania" price: "$74.63" currency: USD in_stock: true reviews_count: 11 category: "Sylvania" url: https://www.desertcart.us/products/48923580-sylvania-400w-grolux-hps-lamp store_origin: US region: United States of America --- # 10% boost in photosynthesis efficiency Enhanced red & blue spectrum 55,000 lumens ultra-bright output Sylvania 400W Grolux HPS Lamp **Brand:** sylvania **Price:** $74.63 **Availability:** ✅ In Stock ## Summary > 🌿 Grow like a pro with the brightest spectrum boost in the game! ## Quick Answers - **What is this?** Sylvania 400W Grolux HPS Lamp by sylvania - **How much does it cost?** $74.63 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/48923580-sylvania-400w-grolux-hps-lamp) ## Best For - sylvania enthusiasts ## Why This Product - Trusted sylvania brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Spectrum Perfected:** Optimized red and blue light for vibrant vegetative and flowering growth. - • **Unmatched Luminosity:** Illuminate your grow space with a blazing 55,000 lumens powerhouse. - • **Photosynthesis Amplified:** Delivers 10% higher photosynthesis flux than standard HPS bulbs—grow smarter, not harder. - • **Heat-Efficient Brilliance:** Bright, intense light with minimal heat output keeps your environment balanced. - • **Plug & Play Compatibility:** Pairs seamlessly with Lumii Digita 400W Ballast for peak performance. ## Overview The Sylvania 400W Grolux HPS Lamp is a high-output horticultural lighting solution delivering 55,000 lumens with an enhanced red and blue spectrum tailored for all growth stages. Offering 10% increased photosynthesis efficiency over standard HPS bulbs, it’s engineered for greenhouse and indoor growers seeking superior plant development. Best used with a Lumii Digita 400W Ballast, this lamp combines intense PAR radiation and a 2050K color temperature to maximize crop yield while maintaining low heat emission. ## Description Product Description Sylvania Grolux Lamps - These colour adjusted Grolux lamps offer a broader spectrum of light making it an ideal lamp for both the vegetative and flowering stages. The Sylvania Grolux HPS bulb was designed specifically for greenhouse supplementary lighting. It has increased blue light and the highest PAR rating. This is the hottest bulb right now and is consistently out-performing its competitors. Legal Disclaimer SEE OUR FEEDBACK TO BUY WITH CONFIDENCE. EVERYTHING WE SEND OUT IS IN PLAIN PACKAGING..! For UK we accept PayPal, money orders, personal cheque, bank transfers or credit cards. Money orders, cheque or cash sent must include a reference or eBay username plus the item number, Postal orders and cash must be sent recorded delivery as we cannot take responsibility for lost money. Alternatively you are more than welcome to collect your order from our premises in cambridge and browse our shop which stocks over 1000 products. Delivery times: Please see our feedback for customer’s comments on speed of delivery. We carry a huge stock level and most courier orders placed before 4 pm are received the next day. For multiple items please click on ‘Request total from seller’ on the payment page. You will be charged the highest postage cost for 1 item then £1 for each additional item. You will not pay more than £10 delivery (ex. heavy items i.e. soils, lights etc.) Items less than 2kg in weight can be sent throughout the UK and N.Ireland at our standard postal rates by Royal Mail Items over 2kg are sent by courier where a delivery surcharge applies to: Highlands & Isle of Wight: Before 16:00 only £16 up to 20kgs in weight for post codes: AB37-38,41-45,51,56, FK19-21, IV1-28,30-37,40,54,63 KW1-3,5-14, PA21-40, PH15-26,30-41,49,50,TD, PO30-41 Scottish Offshore Islands: Two Day Only £20 up to 20kgs in weight for post codes: HS1-9, IV41-56, KA27-28, KW15-17, PA20,40-49,60-78, PH42-44, ZE1-3 Northern Ireland £25 up to 10kg in weight, £1.25 per kilo thereafter Republic of Ireland £35 up to 5 kilos in weight, £2.75 per kilo thereafter Offshore British mainland please message for a quote And if you are unsure about the weight of your order please message first for a quote P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains 1 x lamp See more Review: Nice and powerful output - A nice red 2000 K colour light. Produces a very bright light and not too much heat. Review: As described. - Good for a small area. ## Features - Extreme high light output. Lumens: 55,000 - Improved quality of light : increased red and blue light output - 10% higher photosynthesis flux when compared to standard HPS 'super' bulbs - For the best results, use with a Lumii Digita 400w Ballast - High PAR radiation. Colour temp: 2050 K ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00DQAC4S2 | | Best Sellers Rank | 96,795 in Lighting ( See Top 100 in Lighting ) 1,857 in Fluorescent & Neon Tubes | | Customer Reviews | 3.7 3.7 out of 5 stars (28) | | Date First Available | 6 Feb. 2012 | | Item display weight | 0.1 Kilograms | | Item model number | gro-lux | | Manufacturer | Hydrogarden | | Part number | S400-SY58 | | Product Dimensions | 29.21 x 4.8 x 29.21 cm; 190 g | ## Images ![Sylvania 400W Grolux HPS Lamp - Image 1](https://m.media-amazon.com/images/I/61YSVkp7ZnL.jpg) ## Questions & Answers **Q: Will these be ok to replace sunmaster sl400w.u46.dsp. part#: 10035. 400watt dual spectrum grow lamp?** A: Hi yes... you can replace any bulb as long as it's a 400 watts single end screwing type ..hps red spectrum or dual spectrum bulbs. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nice and powerful output *by C***G on 15 September 2019* A nice red 2000 K colour light. Produces a very bright light and not too much heat. ### ⭐⭐⭐⭐ As described. *by N***L on 19 January 2023* Good for a small area. ### ⭐⭐ first one sent out was broke and didn't work sent ... *by K***S on 5 July 2016* first one sent out was broke and didn't work sent replacement straight away 2nd one sent out worked worked for 12 hours before dying wont attempt a 3rd ## Frequently Bought Together - Hydrogarden 400W SYLVANIA Grolux HPS Lamp - BioBizz 1L Bio-Bloom Liquid - BioBizz All-Mix Pflanzsubstrat mit Perlite 100 Liters Soil --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/48923580-sylvania-400w-grolux-hps-lamp](https://www.desertcart.us/products/48923580-sylvania-400w-grolux-hps-lamp) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-04-22*