{"product_id":"philips-master-55-watt-840-pl-l-4p-cool-white-fluorescent-lamp","title":"Philips Master 55 Watt \/ 840 PL-L 4P Cool White Fluorescent Lamp","description":"\u003csection class=\"gh-product-listing\"\u003e\n\n\u003ch2\u003ePhilips Master 55W 840 PL-L 4P Cool White Fluorescent Lamp — Low-Heat Propagation Lighting at Sensible Cost\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Budget-conscious growers propagating cuttings and seedlings, or anyone running small propagation setups where low heat and proven reliability matter\u003c\/p\u003e\n\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003e\nThis is a proper workhorse fluorescent bulb for propagation work. The 4000K cool white spectrum does exactly what seedlings and cuttings need, the heat output is minimal enough to sit 5-10cm from plants without stress, and it's a fraction of the cost of LED alternatives. One we sell a lot of for growers setting up small propagation spaces on a budget.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eThe Philips Master 55W 840 is a \u003cstrong\u003ecompact fluorescent replacement lamp\u003c\/strong\u003e designed for propagation lighting systems. It's a \u003cstrong\u003ePL-L 4-pin (2G11 base) bulb\u003c\/strong\u003e that produces \u003cstrong\u003e4000K cool white light\u003c\/strong\u003e — the sweet spot for vegetative growth — with minimal heat output and a broad spectrum that works reliably for seedlings, cuttings, and young plant material. This is a replacement bulb for compatible propagation light units, and it gives you consistent performance without the premium pricing of LED alternatives.\u003c\/p\u003e\n\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eThis sits in the proven fluorescent category, positioned against both newer LEDs and other CFL 55W options.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs LED alternatives:\u003c\/strong\u003e Lower upfront cost, proven lifespan of 20,000 hours, requires compatible electronic ballast. LEDs run cooler and longer, but cost considerably more\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs other 55W fluorescent lamps:\u003c\/strong\u003e Philips Master spec sits at the solid end — 4800 lumens, 87 lm\/W efficiency, 82 CRI for decent colour rendering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs T5 fluorescents:\u003c\/strong\u003e PL-L format is more compact and sits better in tight propagation units; T5s are thinner but require different ballasts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn simple terms: proven fluorescent technology at a price point that makes sense for propagation work, especially if you're not ready to commit to LED costs.\u003c\/p\u003e\n\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eThis is a replacement bulb — it requires a compatible \u003cstrong\u003eelectronic high-frequency ballast\u003c\/strong\u003e and PL-L 4-pin socket already built into your propagation light unit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSeedling propagation\u003c\/strong\u003e\u003cbr\u003e\nPosition 5-10cm above young seedlings. The low heat output means you can safely sit the light close without burning delicate growth. Run for 14-16 hours daily during the vegetative stage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCutting propagation\u003c\/strong\u003e\u003cbr\u003e\nIdeal for rooting cuttings under mist or in propagation trays. The 4000K spectrum encourages leaf development without pushing flowering tendencies. Low heat is crucial here — it prevents stress on freshly taken material.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eYoung plant rearing\u003c\/strong\u003e\u003cbr\u003e\nWorks well for leafy greens, herbs, and other soft plant material in the early growth phase. Not suited to flowering or fruiting crops — fluorescent output isn't intense enough for those stages.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOperating notes\u003c\/strong\u003e\u003cbr\u003e\nThis lamp produces approximately 4800 lumens and has an average lifespan of 20,000 hours to 50% light reduction. It's dimmable if your ballast supports it. Replace when light output noticeably drops.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower rating: \u003cstrong\u003e55W\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eColour temperature: \u003cstrong\u003e4000K (cool white)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBase type: \u003cstrong\u003e2G11 socket (PL-L 4-pin)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eLuminous output: \u003cstrong\u003e4800 lumens nominal\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eLuminous efficacy: \u003cstrong\u003e87 lm\/W\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eColour rendering index: \u003cstrong\u003e82 Ra\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAverage lifespan: \u003cstrong\u003e20,000 hours to 50% reduction\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOverall length: \u003cstrong\u003eapproximately 54cm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMercury content: \u003cstrong\u003e2mg\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating voltage: \u003cstrong\u003e105V @ 25°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating current: \u003cstrong\u003e0.525A @ 25°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimmable: \u003cstrong\u003eYes (with compatible ballast)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRequires: \u003cstrong\u003eElectronic high-frequency ballast\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGrowers running small propagation setups with compatible PL-L light units\u003c\/li\u003e\n\u003cli\u003eBudget-conscious propagators who need reliable replacement bulbs without premium pricing\u003c\/li\u003e\n\u003cli\u003eBeginners propagating cuttings or seeds for the first time, where low heat and ease of use matter\u003c\/li\u003e\n\u003cli\u003eAnyone looking to refresh existing propagation lighting systems cost-effectively\u003c\/li\u003e\n\u003cli\u003eOperators of hobby-scale growing operations where seedling health and low running costs are the priority\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThis is a solid, proven fluorescent bulb that does what propagation lighting should do — deliver cool light at safe distances without melting your budget or stressing young plant material. The 4000K spectrum is spot-on for vegetative growth, the heat output is genuinely low, and at this price point you're getting proper kit without paying for LED branding.\u003c\/p\u003e\n\u003cp\u003eIf you've got a compatible propagation light unit and you're looking for a reliable replacement bulb, this is worth picking up. Good time to buy while stock lasts.\u003c\/p\u003e\n\n\u003c\/section\u003e","brand":"PHILIPS MASTER","offers":[{"title":"Default Title","offer_id":47916516016298,"sku":"86722","price":8.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/86722_851c2739-c128-40af-acf4-13b4979598c6.jpg?v=1769194980","url":"https:\/\/growershouse.co.uk\/products\/philips-master-55-watt-840-pl-l-4p-cool-white-fluorescent-lamp","provider":"Growers House ","version":"1.0","type":"link"}