Branded ‘Ultra Flat Optic’ – or UFO – there are 45mm diameter asymmetric (wall washing, top photo) or zoom versions, plus a 67mm zoom version.
Total height from the led emissive point to optical output surface is
- 18mm for the 45mm asymmetric (UFO45A)
- ~14mm for the 45mm zoom (UFO45Z)
- ~22mm for the 67mm zoom (UFO67Z)
They are designed to work with single chip, multi-chip and small CoB leds – the larger zoom works with CoBs up to 14mm – and are suitable for tuneable white use, but not colour mixing. Pages 3 and 4 of the data sheet have compatibility guides.
For wall washing, the asymmetric version should be positioned away from the top of the wall by a third of the wall height (so 1m from a 3m wall), and be spaced apart the same distance, or up to 1.3x that distance (so 1 – 1.3m).
The illumination pattern is a soft rectangle. In an example using a Cree XHP35.2, peak intensity towards the wall is 0.94cd/lm while backwards peak intensity is 0.15cd/lm.
Onto the zoom versions:
The zoom lenses are one-piece with the zoom coming from changing the distance to the led.
The 45mm type produces beams between 13.9 and 35.2° FWHM with a XHP35.2 HI using 6mm of movement (Bridgelux, Citizen and Lumileds examples are also provide), while the UFO67Z’s achieves 12.2 to 35.6° with 9mm of movement.
Holders are provided, which are two-part for the fixed type or three-part for the zooms.
The comprehensive Ultra Flat Optic data sheet can be found here