15w 20w 25w SpecificationsDescription:Anion air-purifying lamp(Full-spiral lamp)---Negative ion lamp 15W 20W 25W AdvantagesNegative ion Vitamin in the air Ion is produced when electron collides with molecule in the air.Those with negative charge are called negative ions. They are everywhere in the nature.Thundering,photosynthesis of plants and waterfall all can bring a great amount of negative ions.That's why peoplefeel refreshing in thundering weather,the forest or under waterfall. The negative ion can effectively activate the oxygen molecule in the air and prevent air-conditioner related disease. It can improve the function of the lung.When people inhale negative ion,Their lung can absorb 20% more oxygen and blow off 15% more CO2. It can activate many kinds of enzyme and improve metabolism. It can make people energetic,Raise efficiency and improve sleep quality. It can clear the dust and smoke by neutralizing their positive electronic charge and making them fall. It can reduce television and computer's ham to people's eyes and keep TV and computer from dust.