{"product_id":"energizer-4w-dimmable-led-st64-filament-bulb-smokey-glass-cool-white-e27-4000k","title":"Energizer 4W Dimmable LED ST64 Filament Bulb - Smokey Glass, Cool White, E27, 4000K","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Energizer ST64 is a 4W dimmable LED filament bulb with a smokey grey glass envelope, E27 screw base, and visible LED filament arrangement mimicking traditional incandescent bulb construction. The bulb produces 320 lumens at 4000K cool white, replacing 40W incandescent bulbs while drawing just 4W from the mains. The smokey glass diffuses light evenly while maintaining the decorative filament visibility that defines the ST64 squirrel-cage aesthetic.\u003c\/p\u003e\n\u003cp\u003eDesigned for pendant fittings, exposed-bulb chandeliers, industrial-style fixtures and table lamps where the bulb itself forms part of the visual design, the ST64 pairs functional light with decorative presence. The 4000K colour temperature provides neutral-to-cool white light that suits kitchens, utility rooms, garages and workshops where colour accuracy and clarity matter more than warmth. Dimming compatibility allows brightness adjustment from full output down to around 10%, controlled by a standard LED-compatible dimmer switch.\u003c\/p\u003e\n\u003cp\u003eThe smokey grey glass finish reduces glare when the bulb is viewed directly and softens the intensity of the LED filament, making the bulb more comfortable to look at in exposed-socket fittings. The ST64 shape measures 64mm in diameter and 145mm in total length including the E27 base, so it sits well in medium-to-large pendant shades and multi-bulb chandeliers without appearing undersized. The 15-year rated lifespan (based on 3 hours daily use) means the bulb should outlast most fittings it's installed in.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (KG)\u003c\/td\u003e\n\u003ctd\u003e0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth (mm)\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight (mm)\u003c\/td\u003e\n\u003ctd\u003e145\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth (mm)\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWattage\u003c\/td\u003e\n\u003ctd\u003e4.5W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLumen\u003c\/td\u003e\n\u003ctd\u003e320\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLamp Shape\u003c\/td\u003e\n\u003ctd\u003eST64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLamp Base\u003c\/td\u003e\n\u003ctd\u003eE27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003eG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKelvin\u003c\/td\u003e\n\u003ctd\u003e4,000K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour Temperature\u003c\/td\u003e\n\u003ctd\u003eCool White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimmable\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBeam Angle\u003c\/td\u003e\n\u003ctd\u003e320\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED or Halogen\u003c\/td\u003e\n\u003ctd\u003eLED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eIs this bulb dimmable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The Energizer ST64 is compatible with most LED-rated dimmer switches and can be dimmed from full brightness down to approximately 10%. Performance varies between dimmer models, so pairing with a quality LED-compatible dimmer is recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does 4000K cool white look like?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e4000K sits in the neutral-to-cool white range. It appears noticeably whiter and crisper than warm white (2700K-3000K) bulbs, without the clinical blue tone of daylight bulbs (5000K+). This temperature suits task-focused spaces like kitchens, workshops and offices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat wattage incandescent does this replace?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bulb produces 320 lumens at 4W, replacing a traditional 40W incandescent bulb. The packaging states 40W replacement despite the higher-wattage claim in some listings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the smokey glass reduce light output?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, slightly. The smokey grey tint diffuses and softens the light, reducing perceived brightness compared to a clear ST64 bulb of the same lumen rating. The trade-off is reduced glare and a more visually comfortable bulb in exposed fittings.\u003c\/p\u003e","brand":"Energizer","offers":[{"title":"Default Title","offer_id":46074253082891,"sku":"S15030","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/S15030_1_5d3f6192-c693-4ad6-bb0e-1712f23bed74.jpg?v=1730312586","url":"https:\/\/niori.co.uk\/products\/energizer-4w-dimmable-led-st64-filament-bulb-smokey-glass-cool-white-e27-4000k","provider":"Niori","version":"1.0","type":"link"}