Norlys Asker 5227GR garden lantern, 3 m post, LED 19.5 W 2827 lm 4000 K, DALI2, graphite, IP65

Asker 5227GR is a lantern on a three-metre post of painted aluminium profile in graphite, with a head measuring 24 × 48.5 cm. This is not a "beside the path" garden lamp but a fitting with road-lighting specifications: 2827 lm, DALI2 control and optics with a defined distribution.

Ledil T2-L lens — light shaped like a road

Instead of spreading light all round, Asker uses a Ledil T2-L lens, corresponding to IESNA type III. That is a distribution designed for linear runs: the flux forms an elongated, asymmetric rectangle along the axis of the road, with little reach behind. In practice it means that with posts spaced along a drive or a walk the pools of light join without dark gaps, while the light does not spill onto the neighbouring plot or into a building's windows.

ULOR 0.84% — practically no light to the sky

The maker gives an upward light output ratio of 0.84% and a BUG classification of B1-U2-G1. These are figures with legal and neighbourly weight: more and more municipalities limit light pollution, and a ULOR below 1% means practically all the flux goes where it should — downward. The G1 value in turn indicates low glare toward an observer.

DALI2 — control, not just a switch

The fitting supports the DALI2 protocol, that is digital lighting control. On a single garden lantern this is surplus, but on a run of lanterns along an access road or across an estate it allows dimming to a schedule (full output until 23:00, then 30%), grouping of fittings, and fault diagnosis from the controller. DALI2 needs a separate pair of control wires — a decision to take while the cabling is being laid, not after the posts are concreted in.

Specification

• Manufacturer code: 5227GR (Asker series); EAN 7042890522784
• Type: garden lantern / lighting post
• Dimensions: 24 × 48.5 × 300 cm (head × post height)
• Luminaire power: 19.5 W (LED module 16.8 W)
• Luminaire flux: 2827 lm (module flux 2910 lm)
• Efficacy: 145 lm/W (luminaire), 173.2 lm/W (module)
• Colour temperature: 4000 K — neutral white; CRI 70; colour consistency SDCM5
• Energy efficiency class: D; life 100,000 h (about 91 years at 3 h a day)
• Control: DALI2
• Supply: 220–240 V; PF 0.99
• Protection class: I (earth required)
• Ingress protection: IP65; impact resistance: IK08
• Temperature range: −20 … +45 °C
• Optics: Ledil T2-L lens (IESNA type III); BUG B1-U2-G1; ULOR 0.84%
• Mounting: 4 holes for M14 pins, 180 × 180 mm spacing; fits concrete foundation B 50
• Construction: two-segment; silicone gasket; outer sealed lens in clear PMMA
• Material: painted aluminium profile; graphite colour
• Net weight: 11.0 kg; gross: 17.1 kg
• Origin: European Union

The foundation must be planned separately

A three-metre post weighing 11 kg is fixed on four M14 pins at 180 × 180 mm spacing. The maker notes that mounting accessories are bought separately and lists the matching items: mounting adapter (index 1259), ground anchor (180) and concreting anchor (3091); the post also fits a ready-made B 50 concrete foundation. That is a decision to take before the concrete is poured — the pins must be set at the correct spacing and level, because a three-metre structure shows any deviation from vertical mercilessly.

CRI 70 — why lower than in a domestic fitting

A colour rendering index of 70 is lower than the usual 80 of interior lighting, and that is deliberate: in road and area lighting the priority is efficacy — here as much as 145 lm/W for the complete luminaire — rather than colour fidelity, because at night the eye works in conditions where colour discrimination is limited anyway. SDCM5 consistency in turn means that across a run of a dozen lanterns small differences in the shade of white may occur between units — imperceptible in road lighting, but it is worth ordering the whole run from one delivery.

Two-segment construction

The post consists of two segments, which simplifies transporting and erecting a three-metre structure — there is no single long element to manoeuvre. Sealing is by a silicone gasket, and the fitting is closed on the outside by a sealed lens in clear PMMA. The operating range of −20 to +45 °C covers the climate with margin.

About the manufacturer

Norlys is a Norwegian maker of outdoor lighting from Oslo, specialising in façade fittings, bollards and lanterns designed for the Scandinavian climate. Production takes place in the European Union.