For the complete or additional artificial lighting of plants, the Gro-Lux is a fluorescent T8 tube light bulb that assists plant growth in locations with insufficient daylight. Fitted with a standard sized G13 2-pin (13mm apart) caps to both ends.Emits a high level of blue and red radiation, which helps promote healthy plant growth. Recommended for use in greenhouses, indoor gardens, flower shows and conservatories. Also recommended for aquarium lighting - Gro-Lux tubes will strengthen the natural colours of your aquatic plants and fish.For maximum performance and efficiency from your new fluorescent tube, we recommend you replace the fluorescent starter at the same time.Need more help in choosing a suitable fluorescent tube? Read our guide Choosing Flourescent Tubes and our guide to Flourescent Starters.