Koster Double Head 1177AL is a pole-top light with two dome-shaped heads on a shared crossarm, made to slip onto a lighting pole with a Ø60 mm mounting spigot. The body is powder-coated cast aluminium in light grey RAL 9006, and each head is closed underneath by a clear, textured diffuser of UV-stabilised polycarbonate. No pole is included – the luminaire is paired with a pole bought separately.
Size and mounting on the pole
Edge to edge across both heads, the luminaire is 82.5 cm wide; each head is 24.5 cm in diameter and the whole fitting is 22.5 cm high. The pole spigot slides 80 mm into the luminaire, so it has to be exactly Ø60 mm. The luminaire weighs 6.38 kg and has a side area of 0.2 m² – both figures are checked against the load the pole manufacturer allows at the top of the pole.
A 3.7 m cable leaves the luminaire and is connected to the installation inside the pole, in a suitably chosen junction box. The fitting is protection class I, so the supply must include a protective earth conductor.
Light source and light distribution
Each head takes one LED lamp with an E27 base in A55–A60 shape, up to 9 W – two lamps for the whole fitting. They are not included, so you choose the colour and brightness yourself; as a reference, an LED lamp of about 800 lm gives as much light as an old 60 W bulb. The user changes them without a technician.
Light leaves only downwards, symmetrically below each head, and the ULOR is 0 %. So no light goes above the diffusers – not into the sky, not into upper-floor windows.
Durability and where it fits
IP65 means the luminaire is dust-tight and protected against water jets from any direction, and IK10 is the highest impact-resistance grade on the IK scale. The manufacturer gives an operating range of −20 to +45 °C. The diffuser is a spare part – Norlys supplies it as service kit 06710000.
The luminaire is intended for gardens and parks and for the grounds of hotels and restaurants, where one pole lights two spots set apart by the width of the crossarm. The plain, unornamented domes follow the Scandinavian style. To order, Norlys also makes the luminaire in another colour from the RAL range.
