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Potential major adverse effects of flicker identified in published research and/or Expert Opinion includes these five factors: Photoepilepsy or flashing-light-induced seizure. Stroboscopic effect and associated apparent slowing or stoppage of rotating machinery. Migraine or severe paroxysmal headache is often associated with nausea and visual disturbances. Increased repetitive behavior among persons with autism. Asthenopia, including eyestrain, fatigue, blurred vision, conventional headache, and decreased performance on sight-related tasks. What Colour Temperature Should I Choose? How to Determine How Many Lumens You’ll Need to Properly Light Your Space? SANSI 60W Equivalent A15 LED Light Bulb,4 Pack 900 Lumens Light Bulb with Ceramic Technology,3000K Daylight Non- Dimmable, 25,000 Hours Lifetime, E26, Efficient & Safe 9W Energy Saving for Home Improvement Lighting, ETL Certification 💡Bright & Efficient: Compared with other LED bulbs, SANSI’s highly efficient E26 light bulbs can provide 900 lumens using only 9 watts of power, equivalent to 60W incandescent bulbs. Based on 3 hours per day usage, save up to 85% electricity, annual estimated cost $1. 💡 Patented Ceramic technology: SANSI’s patented technology replaces the traditional Mcpcb the aluminum substrate with a non-conductive ceramic heat sink, directly soldering the LED chip on the ceramic heat sink, effectively reducing the system thermal resistance between the LED PN junction and the surface of the heat sink, resulting in faster heat conduction and higher product reliability, making SANSI’s bulbs perform with higher light efficiency. 💡 Flicker-Free: Adopting high light transmission optical lenses, up to 17 LED chips can not only provide you and your family with the light source they need daily but also provide a healthy living or work environment. No flickering, no noise. 💡 Safe and Reliable: The lamp body is made of special ceramic material and the flame retardant grade reaches grade V0; the reinforced insulation structure means no risk of electric shock, its safer; the whole shell material reaches the WF2 anti-corrosion grade, which is more reliable and durable; The hollow design is good for heat dissipation. 💡 Guarantees: ETL listed, quality and safety verified, 22.5 years LED bulb lifespan, 5 years warranty. 13W 5000K 17W Dimmable 5000K 22W 5000K 27W 5000K 27W Dimmable 5000K Lumen 1600 2500 3000 4000 4000 Incandescent Equivalent (Watts) 100W 150W 200W 250W 250W Bulb Size A19 A19 A21 A21 A21 Dimmable – ✓ – – ✓ Color Temperature 5000K 5000K 5000K 5000K 5000K Certification ETL/RoHS ETL/RoHS ETL/RoHS ETL/RoHS ETL/RoHS Lifespan (Years) 22.5 22.5 22.5 22.5 22.5 Package 4-Pack 1-Pack 2-Pack 2-Pack 2-Pack First: No reason to return within 30 days after receiving the goodsSecond(1) The seller pays the return shipping fee under the following circumstances: the fault party is the seller, and the shipping fee generated by the return is paid by the seller A. The buyer feels that the photos do not match the product description or that the product has certain defects. B. The received product does not work, the product is broken. C. The seller sent less spare parts when delivering the goods. D. The seller sent the wrong item when delivering the goods. E. After the buyer receives the goods, the goods are in a damaged state. (2) The return shipping fee is paid by the buyer in the following cases:The main reason for requesting a return is that the buyer himself does not want the item.For example:A. After receiving the goods, the buyer will feel that the product is not suitable and choose to return it. B. After buying the product, you don?t like it or don?t want it anymore, and you want to return it. C. After receiving the product, you found that other companies have a lower price, so I want to return it. D. It is purely because the buyer suddenly doesn’t like the product and wants to return it. Our new products are generally guaranteed for five years, but the five-year warranty does not mean that any damage to the product within five years can be replaced unconditionallyIf your product is older than one year, you need to pay for shippingIf your product is more than two years old, you need to pay part of the product price and freight according to the specific situationSecond-hand product warranty period of three months