CS124 Connected Bulb Outshines Rivals Case Study 20170130 ©2017 Lumileds Holding B.V. All rights reserved.

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Solution

Today, LEDs are capable of achieving unprecedented

efficiency while also being offered in a range of individually

packaged colors for ease of design. Following an evaluation of

the best LEDs on the market, Leedarson chose the LUXEON

335L Color Line to illuminate its smart bulb. Relative to its

competitors, the LUXEON 3535L Color Line offers a broader

color range with higher flux and better price performance. The

LUXEON 3535L Color Line also excels in efficiency. Cool white

efficacy is 165 lm/W and warm white efficacy is 150 lm/W

when driven at 100mA. The LEDs can also be driven at 200mA

to achieve higher flux.

The smart bulb combines a total of 31 Red, Green, Blue

and White LEDs (7:5:5:14) arranged strategically around the

perimeter of the bulb for excellent color mixing. Modeling

of the LEDs in various positions produced the optimum LED

arrangement. To reduce unnecessary heat build-up and

optimize performance, the driver electronics were designed

specifically for use with the LED configuration in the bulb. A

further design optimization revolved around positioning the

radio antenna used for wireless communication. In previous

designs, the antenna stood at the top center of the bulb with

LEDs around it. However, that real estate is now needed for

LEDs. The antenna had to be integrated into the lower portion

of the bulb while maintaining effectiveness.

Results and Benefits

Performance of the Leedarson bulb meets or exceeds that

of the smart bulb market leader. For instance, the Leedarson

bulb achieves 600 lumens at 2700K color temperature,

features a tunable white light range of 2700K-6500K, and

delivers 80 lm/W efficacy at 4000K. Because of the company’s

proprietary color calibration technique, color differences

between multiple bulbs with identical settings are negligible.

Tight color binning of the LUXEON 3535L LEDs further

leads to better color control within the lamp, as well as from

lamp to lamp. Due to the full color range from the LUXEON

3535L, the bulb can deliver up to 16 million colors, providing

more choices for consumers than with other bulbs. Light is

distributed at a 240° beam angle from the smart bulb.

In addition to excellent light quality, consumers demand a

reliable product. The Leedarson bulb is rated for 25,000 hours

of operation. The LUXEON 3535L Color Line is the only line of

its type to pass 35,000 hours of lumen maintenance testing at

test conditions as high as 105°C and 150mA.

”LED choice can mean the difference between good light and excellent light. The less

expensive connected bulbs cannot pass ErP regulations for 6 SDCM, whereas our

bulbs consistently measure less than 3 SDCM at 20 points in production.”

— John Liu, VP of Engineering, IoT Product Line, Leedarson