Archive for October, 2010

This is by far the easiest design so far. No soldering, no separate power supply and driver to combine. Dimming can be done with a wall box control, so the product is clean if knobs. With only 4 watts involved, the internal backplate does the job for a heat sink. This was simply a matter of taking an off-shelf piece of Spanish glass, making a holder and backing plate with trim, add a little mounting box to hide the transformer, and snap it together.

This is an AC LED product, using LynkLabs sconce module. The module has Tyco wire trap connectors, which make wiring as simple as strip and push. In this case, the output from the LynkLabs Brite Driver is wired directly to the strip. I used a cord to connect the sconce to an outlet, since I don’t have any wall boxes handy.

A nice, simple wall sconce that was easier to build than a CFL sconce, and uses considerably less power, and looks very nice on the wall. Not bad for less than 9 hours work, no? If all of the designs so far had been this easy, I would be thrilled.

More at Lumenique 52 in 52 D33

I like the look of theatrical lighting, especially the ellipsoids and zooms. I’ve converted several to SSL, including fresnels,  Kliegl and Colortran zoom ellipsoids. Unfortunately, being designed for 500-1000 watt halogen lamps and use in stage applications, even the small mini-versions of these fixtures are too large for small spaces.

This design takes its aesthetic cues from theatrical lighting, along with styling from the days when movies and theater were the center of the entertainment universe.

The design provides full rotation of each arm about the vertical standard, rotation of each fixture yoke at the end of the arms, and aiming of the fixture in each yoke. In other words, each head can be aimed pretty much anywhere. In addition to this, each of the heads has its own driver with dimmer control, so after its been aimed, balancing light levels can be set easily. At the base, a single on-off switch means that the individual dimmer settings can be left alone.

The light source used for each head is a Cree MCE LED with 25 degree TIR optic. The ehat sink is buring inside each of the heads. Future iterations of a design like this will likely include an adjustable zoom optic, as well as color adjustment. The total height of the stand is 37″, and the base include a 7 1/2 pound iron weight for stability.

More at Lumenique 52 in 52 D32

For those in the business, LEDs can at times drive one from ones skull. This thought inspired this design – a physical representation of LEDs being driven from a skull. To represent how resistance is not only futile, but will be incorporated, I utilized resisters in the drive circuit, exposed at the rear of the skull. These balance the fV of the upper white Cree MCE LED with the lower (3) red Rebel LEDs, driving from a single constant current power supply. When dimmed, the result is the white (higher fV) dims down first, then the red after the white is off. producing a unique effect from a single control.

As a point of reference, this is not the first expression of this type. I like the subtle twist of phrase that can present a new visual result. For example (see images below), Alien Landings are a part of our pop culture… but what happens if they forget their parachute? Or, Butter Fly collections have been put together for centuries, macabre little collections of insects with pins through their bodies… why not collect Bar Flies then, very colorful and strange, with pins through their chests? The term “Gearhead” has been used to describe auto enthusiasts, but what might one actually look like? How about a portrait of Tim O’LEARee? Occasionally these strange but humorous thoughts inspire a work of expression. I also like 3D in art, even if it is hung on the wall.

The skull seemed appropriate topically, as well as timely, since this is October, with Halloween coming just ’round the corner.

Of course, there is more at Lumenique 52 in 52 D31

Working with Molex Electronics, the ZEBRA Alliance, Oak Ridge National Labs, with fixtures provided by Ultralights and Solid State Luminaires, we created a side-by-side comparison between CFL and LED in two identical homes. One uses 100% CFL lighting, the other 100% LEDs. The LED house uses Molex Transcend modular products, which incorporate 4W Seoul Semiconductor Acriche 120VAC LEDs to control costs. While the CFL home was designed by a lighting showroom, the approach in the LED home included redressing lighting design to reduce and elliminate glare, focus on delivering light where it is needed, and producing more attractive spaces that also save energy. The end result is a 70%+ savings over the CFL home. The LED home has less than 0.4W/s.f. of connected lighting load. So little energy is connected, that the entire home could have been wired to a single 15A circuit breaker (920W).

The purpose of this project is to operate both homes with controls that simulate occupied operation over 18-24 months. Over that time the performance of the two homes will be monitored using a sophisticated array of sensors and data aquisition. Lighting is just one small part of the total effort, which includes building materials, HVAC, window glazing, and roofing system performance. There are four total homes, all with identical geographic orientation, within a block of one another. The other two utilize fluorescent lighting, but are different in many other ways, including architectural design.

Below are a few of the rooms of the houses to give you an idea of how the combined approach worked out. As one can see, the difference in appearance is noticeable. At the task level, the LED house provides twice the horizontal illumination on kitchen counters and dining table, matches the CFL in the game room and office (not shown here), and provides a more comfortable light everywhere, as the light sources produce no objectionable glare. So, regardless of the LED employed not being a leading edge lumen/watt producer, the savings remain significant, while the end product – delivered illumination – both attractive and comfortable. This is an approach that will eventually set LEDs up as the preferred light source in residential application – not matching CFL glare bombs, but delivering an improvement in lighted quality as well as energy saving.

For those attending the LEDs 2010 conference this month (Oct 25-27) in San Diego, I will be presenting this project with some background and more detail there.  Stop by and say hello if you are in the area:

Entry CFL Lighting

Entry LED Lighting

Living CFL Lighting

Living Room LED Lighting

Dining Room CFL Lighting

Living Room LED Lighting

Kitchen CFL and Linear Fluorescent Lighting

Kichen LED Lighting