We carry replacement T5 grow bulbs that will fit all 2ft (55cm) and 4ft (110cm) T5 grow lights fixtures using T5 tubes. T5 tubes are available in 2 spectrums: 865 White / Blue Spectrum Propagating - for the grow phase and also 830 Red Spectrum - for flowering and bloom. All our T5 tubes are made by Philips and are from the TL5 HO range. T5 grow light bulbs are easily interchangeable and allow you to give your plants the exact wavelengths of light they need at all phases of their growth. Will fit all our LightWave T5 range.