You can now relieve the symptoms of Seasonal Affective Disorder (SAD) and Ionise the air in your home or office with our latest product. The Daylight Ioniser Bulb.Each bulb covers a 3 cubic metre area and emits 3.5million negative ions per centimetre through the use of an ion generator contained within the structure of the bulb or tube. As a result a feeling of wellbeing is experienced, which may be of particular benefit to respiratory sufferers such as those with asthma, hayfever and bronchitis.