Meets I.M.O. Specifications (international regulations for prevention of collisions at sea, colreg ’72). For boats of less than 20 metres in length. In order to comply with the I.M.O. regulations, each navigation light type 35 requires a special focussed 25 W bulb, type LAMP1225 (12V) or LAMP2425 (24V). These bulbs must be ordered separately.