{"product_id":"circle-4-pack-plc-18w-841-4-pin-g24q-2-18-watt-double-tube-compact-fluorescent-cfl-4100k-cool-white-replaces-sylvania-20668-cf18dd-e-841","title":"Circle (4 Pack PLC-18W 841, 4 Pin G24q-2, 18 Watt Double Tube Compact Fluorescent CFL, 4100K Cool White - Replaces Sylvania 20668 CF18DD\/E\/841","description":"\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Circle\u003c\/p\u003e\u003cp\u003eCircle PLC-18W 841 Compact Fluorescent Bulbs - 4-Pin G24q-2 Double Tube CFL, 18 Watt, 4100K Cool White (4 Pack) Keep your fixtures running at full performance with Circle's PLC-18W 841 compact fluorescent replacement bulbs. Designed as a direct equivalent for Sylvania 20668 (CF18DD\/E\/841\/ECO), Philips PL-C 18W\/841\/4P\/ALTO, and GE F18DBX\/841\/ECO4P, these bulbs install into any compatible G24q-2 4-pin ballast-operated fixture with no modifications required. Light Quality You Can Count On Each bulb delivers 4100K cool white light - the \"841\" designation confirms both the 4100 Kelvin color temperature and the 80+ CRI color rendering quality. This combination produces accurate, clean illumination that minimizes eye fatigue in workspaces, retail environments, and commercial buildings. The 82 CRI rating means colors appear true and natural under these lights - important in offices, healthcare waiting areas, retail displays, and classrooms. Where These Bulbs Perform Best These 18-watt double tube CFLs are well-suited for a wide range of indoor applications: Office buildings and open-plan workspaces Commercial retail and display lighting Hallways, corridors, and exit pathways Kitchens, break rooms, and utility areas Recessed downlight fixtures using G24q-2 sockets Storage rooms, warehouses, and maintenance facilities Educational facilities and institutional buildings Fixture \u0026amp; Ballast Compatibility This bulb uses a 4-pin G24q-2 base and is designed for use with compatible electronic or magnetic ballasts rated for 18-watt PL-C double tube lamps. The 4-pin base requires a ballast in the fixture - it does not operate on direct 120V line voltage without a ballast present. If replacing an existing bulb, simply match the base type: G24q-2 (4-pin) is required. Do not attempt to install in 2-pin G24d-2 sockets. Long-Term Performance Rated for up to 12,000 hours of average life, these bulbs reduce the frequency of replacements in both residential and commercial settings. For facility managers maintaining multiple fixtures, the longer service interval helps lower maintenance costs and reduces the frequency of lamp changeouts in hard-to-reach fixtures. Specifications at a Glance Wattage: 18W Base: G24q-2 (4-Pin) Color Temperature: 4100K (Cool White) CRI: 82 Configuration: Double Tube (PL-C) Length: 6 inches Average Rated Life: 12,000 hours Pack Quantity: 4 Model: PLC\/18\/E\/DD\/841 Replaces: Sylvania 20668 \/ CF18DD\/E\/841\/ECO | Philips PL-C 18W\/841\/4P\/ALTO \/ 38329-9 | GE F18DBX\/841\/ECO4P For indoor ballast-operated fixtures only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDIRECT REPLACEMENT CONFIDENCE (Compatibility \u0026amp; Cross-Reference) FITS YOUR FIXTURE - This 18-watt double tube compact fluorescent CFL bulb features a standard G24q-2 4-pin base, providing a direct drop-in replacement for fixtures using Sylvania 20668 (CF18DD\/E\/841\/ECO), Philips PL-C 18W\/841\/4P\/ALTO, and GE F18DBX\/841\/ECO4P. If your fixture currently holds any of these bulbs, this Circle replacement installs without any rewiring or fixture modification.\u003c\/li\u003e\n\u003cli\u003eBALLAST COMPATIBILITY (The #1 Customer Question) BALLAST-OPERATED DESIGN - This 4-pin G24q-2 CFL is designed to operate with compatible electronic and magnetic ballasts rated for 18-watt PL-C double tube lamps. The 4-pin configuration requires a ballast - it is not a direct line-voltage plug-in. Verify your fixture uses a G24q-2 socket (not G24d-2, which is 2-pin) before purchasing. For replacement questions, the base type can be confirmed by counting the pins on your existing bulb.\u003c\/li\u003e\n\u003cli\u003eLIGHT QUALITY \u0026amp; APPLICATIONS 4100K COOL WHITE LIGHT WITH 82 CRI - Delivers crisp, neutral cool white illumination at 4100 Kelvin with an 82 Color Rendering Index (CRI), producing accurate, natural-looking light that reduces eye strain in task-oriented environments. Ideal for offices, conference rooms, commercial retail spaces, hallways, kitchens, utility rooms, storage areas, and recessed downlight fixtures. The 841 designation confirms 4100K color temperature with 80+ CRI - a commercial-standard specification.\u003c\/li\u003e\n\u003cli\u003eLIFESPAN \u0026amp; VALUE 12,000-HOUR AVERAGE RATED LIFE - Each bulb is rated for up to 12,000 hours of average operation, meaning fewer replacements, lower maintenance frequency, and reduced per-fixture cost over time. This 4-pack provides dependable, long-lasting performance for both residential and commercial applications where reliable uptime matters. At 18 watts per bulb, this compact fluorescent consumes less power than equivalent-output incandescent or older fluorescent sources.\u003c\/li\u003e\n\u003cli\u003eSPECIFICATIONS \u0026amp; PACK DETAILS COMPLETE SPECIFICATIONS: 18 Watts\u003c\/li\u003e\n\u003cli\u003eG24q-2 4-Pin Base\u003c\/li\u003e\n\u003cli\u003e4100K Cool White\u003c\/li\u003e\n\u003cli\u003e82 CRI\u003c\/li\u003e\n\u003cli\u003eDouble Tube (PL-C)\u003c\/li\u003e\n\u003cli\u003e6 Inches Overall Length\u003c\/li\u003e\n\u003cli\u003eReplaces: Sylvania 20668 \/ CF18DD\/E\/841\/ECO, Philips 38329-9 \/ PL-C 18W\/841\/4P\/ALTO, GE F18DBX\/841\/ECO4P\u003c\/li\u003e\n\u003cli\u003ePack of 4\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e 4100k\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 4 Pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e PCL-CLC Parent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Circle","offers":[{"title":"Default Title","offer_id":52724146536730,"sku":"MCAB01GU5S9BK","price":126.05,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0965\/6772\/2266\/files\/61H1fAj1AKS_278ea30f-c486-48b1-b4a3-22ee4320a08a.jpg?v=1787236988","url":"https:\/\/craftedyogi.com\/products\/circle-4-pack-plc-18w-841-4-pin-g24q-2-18-watt-double-tube-compact-fluorescent-cfl-4100k-cool-white-replaces-sylvania-20668-cf18dd-e-841","provider":"Craftedyogi","version":"1.0","type":"link"}