T20 (suitable for tanks 20-30cm)
T30 (suitable for tanks 30-40cm)
T40 (suitable for tanks 40-50cm)
T50 (suitable for tanks 50-60cm)
T60 (suitable for tanks 60-70cm)
T90 (suitable for tank 90-100cm)
T20: 6W
T30: 10W
T40: 14W
T50: 18W
T60: 20W
T90: 25W
