The color of these lamps is mainly red and stands out in these orange, red and yellow tones that produces more flower buds, improves blooming, fats the flowers, etc. Within this group there are some lamps whose spectrum also covers blue tones and are well known in horticulture (Philips Son-T Agro, Sylvana Grolux and Philips Master Son-T PIA).
For the use of these bulbs it is necessary to have a ballast of equal power, cannot be connected directly to the power grid.