Led Luminaries

Osram has introduced SFH 4776, a boadband infra-red in the firm’s 2.75 x 2.0 x 0.6mm high Synios package. The technology inside is a blue-emitting GaN die and phosphor converter, specially developed for spectroscopy, that converts the blue light into radiation across 650 to 1,050nm. “By making improvements to the phosphor material, developers at Osram Opto Semiconductors have succeeded in increasing the intensity ...

Ledil’s Daisy is a lens/shroud combination intended to cut glare “Tin offices. Beam angle is ±40°, with pretty even illumination across ±30°, and it comes in x4 and x28 versions – the latter 1.140m long. Optimised for 2835 leds, it is compatible with packages up to 5630, said the firm. With Samsung LM28xB leds, the figures are: ±39°, 84% efficiency (“High efficiency, despite ...

Update: Thanks to Ledil technical marketing manager Samuli Saransalmi for getting in touch to fill in some details (integrated below) on this interesting optic. Ledil is aiming at architecture narrow-beam wall-washing with a sharp cut-off lens called Leia – achieving beams around ±1.5° (3° FWHM) with single chip 3535 high-power LEDs, with a “very strong cut off,” said Saransalmi. “There is very little ...

I took my eye of the ball and missed Gaggione’s LLC25N collimator, which was released at the end of last year. See also this update It brings the firm’s colour mixing technology to its 32mm diameter form-factor, providing “state-of-the-art colour mixing for RGBW or tunable white applications”, claimed Gaggione at the time. “It is also capable of great beam results ...

Cree has introduced an ‘S Line’ version of its XP-G3 led line – the remainder is now called ‘Standard’. “Through innovations in component architecture, the new XLamp XP-G3 S Line LED can withstand double the number of switching cycles when compared to competing leds in its class,” said Cree in the launch paperwork – leaving me to wonder if the ...

While pondering the heat shedding capability of a 100mm diameter sheet of 3mm thick aluminium with an led on a star board bolted to it, I came across the rule of thumb formula: Rha = 50/√(area in cm2) I believe this is for ‘sufficiently thick’ plates Does anyone know where this comes from? And if it suits horizontal flat plates ...

According to the University of Toledo, it has found a mechanism for a direct link between blue light exposure and age-related macular degeneration. A quick look at the scientific report revealed that when the researchers tried light at 445, 488, 515 and 594nm,  only light at 445nm did any damage. The university is mentions sunlight and screens – phone, tablet ...

A combination of IR (850nm), red (660nm) and violet (405nm) leds has proved effective against ulcers on fingers caused by the auto-immune disease systemic sclerosis, according to University of Manchester and Salford Royal NHS Foundation Trust which 14 ulcers amongst eight patients were exposed to 10J/cm2 for 15 minutes twice weekly for three weeks, with follow-up at weeks four and eight. ...

Gaggione has introduced a 67mm dia one-piece zoom collimator for 6mm diameter emitter CoBs – where is it said to zoom across ±5 to ±11° to 50% (10-22° FWHM) and ±9° to ±22.5° to 10% (18-45° FWTM). As this is zoomed simply by moving the one-piece collimator back and forth in front of the CoB, I was keen to see some beam ...

Cree has introduced a ‘High Efficacy’ (HE) version of its venerable XP-G2 led, making a device with “higher output and greater efficiency” compared with the original XP-G2. Cree has added some detail below The difference is the use of the “newest Dmax high-power chip technology”, said the firm. Branding over. The numbers are, said the firm: 25% greater output via a ...