LED Luminaries

LED news and insight from our technology editor Steve Bush, who has been messing with LED lighting for more years than he would care to remember.

You might have missed it: Ledil Rita

05jun13LedilRitaCloseA 314It is not often you see something properly new in LED optics.

Polymer Optics managed it with its hybrid lens/reflector, mentioned here, and last year Ledil pulled a rabbit out of the hat with its Rita reflectors.

When describing the Rita series, wonky white funnel seems to sum it up.

Rita-A came first (left) – intended for task and application lighting.

Its funnel effectively forms a beam, and pushes it over sideways – the peak is 30° off-axis.

If on-axis straight ahead is 0°, most of the beam is between 5° and 55°.

05jun13LedilRitaA beam 300So you can mount the light on the wall (right) and have it illuminate a table top without lighting the wall up, or mount it on the ceiling to light up a painting (see diagram) without lighting the ceiling.

It rotates to move light around, direct the light, and “Rita-A can be mounted side-by-side [on the ceiling] to illuminate long walls with minimal hot-spots or shadowing,” said Ledil. “Outdoor applications include residential lamps used in urban areas or for lighting stairwells in parking garages.”

Efficiency is 86%, despite having no metallisation (oddly, the data sheet says: “Reflector is made of aluminium coated…”).

It is pretty small – 17.1mm tall (17.3mm with mounting tape) on a 22mm base, occupying 28.4x36mm.

The firm has qualified it for Cree XT-E, and Rebel and Luxeon M from Lumileds.

Tech specs include: use up to 115°C, UL 94 V-2 flammability rating, and moulded alignment pins.

05jun13LedilRitaWas 368Then came the Rita-Was (both left and below), a Rita for wall-washing with a beam including 0° and extending to 40° (below, nominal offset is 20°).

Height is again 17.3 mm and it needs a 31,9×28,4mm footprint .

Stated efficiency is 85%.

Qualification, so far, is for Cree XM, XT and XP leds, Osram Oslon Square EC, and Lumileds Luxeon M and A. 05jun13edilRitaWas beam 377

Tags: metallisation, parking garages, reflectors, stairwells, wonky

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