G13 t8 18w 58w blue red green fluorescent bulb coloured t8 osramthe highlight white on the outside coloured on the inside the colour first changes when it is turned ontechnical data18 w length 590 mm red 900 lumen18 w length 590 mm green 1 800 lumen18 w length 590 mm blue 400 lumen36 w length 1200 mm red 2 400 lumen36 w length 1200 mm green 4 400 lumen36 w length 1200 mm blue 900 lumen58 w length 1500 mm red 3 800 lumen58 w length 1500 mm green 6 700 lumen58 w