Monthly Archives: June 2011

LED bulbs, light of the future

The Perfect LED Light

Copyright 2001 by Garry Petrie

The perfect LED light is designed for cavers who want an efficient, uniform and constant bright light for caving. This article contains some very specific technical information and it is assumed the reader has a basic understanding of electronics. To build the light, the reader also must have some experience soldering, drilling, wiring and cutting small objects. The list of required tools include a multi-meter, Dremel drill and soldering station. The electronics are available from major semiconductor manufactures has “evaluation” kits, but nothing should prevent the reader from “rolling their own” design. The principle cost of the light is the white LED’s. The best white LED’s are made by Nichia Corporation and are expensive. However, it makes no sense to undertake the project without starting with the best LED’s available.

A variation on the Mega Design is described, which adds six more LED’s and provides for current regulation, as opposed to voltage in the original Mega Design. The yellow LED’s were substituted with green LED’s. This designs accounts for the negative temperature coefficient of a LED, that as the LED heats up, it will draw more current. Either mode of regulation works, provided there is proper thermal regulation in the system.

LumiLeds now has an alternative to the single 5mm Nichia LED’s. It is their Luxeon Star device. It is a single device that operates at 350ma and comes with a built in lens to produce a bright, 10 degrees, beam. This product should make an excellent spot light. Here are micro-photographs of the front and back of the actual die after the phosphorescing dye removed. Be warned, the Luxeon data sheet does not describe a hidden oppositely configured diode with a relatively low Vf. Connecting at power supply equal to the typical forward voltage of 3.5v in reverse will destroy the device.

AAXA Technologies and Wavien joint LED bulb

SOURCE Wavien, Inc.

VALENCIA, Calif., June 16, 2011 /PRNewswire/ — Wavien, Inc. announces today the introduction of a 1,000-lumen LED projector to be manufactured and sold by AAXA Technologies, Inc. (AAXA). This new projector, which uses Wavien’s proprietary DPR™ light engine, outperforms LED projectors by producing 1,000 lumens of brightness and a lifetime of 25,000 hours at the cost of a conventional desktop projector.

A production prototype unit will be shown at the Wavien booth, #5283, at the InfoComm in Orlando, Florida from June 15th to 17th. Performance, pricing, and delivery details for the new projector are now available from AAXA.

“Wavien’s DPR light engine provides a maintenance-free light source for projectors suitable for home theater/gaming applications, classrooms and small conference rooms. It outperforms LED projectors, providing a higher output, smaller footprint and longer lifetime, at a lower cost,” stated Dr. Kenneth Li, President and CEO of Wavien, Inc., who is also the inventor of the DPR technology. Dr. Li added: “This unique patented design enables a significant reduction in the cost of projector operation, which is especially important for use at home and classrooms where projector usage is very high and trouble-free operation is essential. We are very excited to work with AAXA, with its proven track record for manufacturing and marketing cutting-edge projectors on a worldwide scale.”

“The maintenance-free features of LED and hybrid projectors created expectations in consumers that all state-of-the-art projectors should use those technologies. We have identified a void in the market for affordable priced LED projectors with a screen brightness of about 1,000 lumens. LED projector outputs are too low, and hybrid projectors are costly,” stated Gary Huang, Vice President of Sales and Marketing at AAXA. “We are very fortunate to have identified Wavien’s DPR light engine technology, which allows us to fill this void in the market. We believe that there is a great opportunity in this area by combining Wavien’s technology with AAXA’s manufacturing, sales and marketing capabilities,” added Mr. Huang.

LG HX300 LED projector

The LG HX300G LED projector boasts distinctive, clear color imaging and offers increased durability with long lamp life of approximately 30,000 hours. With an output brightness of 300 ANSI-lumens, the HX300G LED projector allows users to view video content in a darkened room with reduced distortion.

 

Weighing only 1.7lbs, the HX300G LED projector is a good travel companion for those executives that are frequently on the road as it is compact and lightweight. The All File Viewer function supports all Microsoft Office files and includes a USB port and support for HD DivX, MP3 and JPEG files, making it ideal for presentations.

To connect this LED projector to a computer or disc player, there is HDMI 1.3 built in.

Specifications include:

  • 0.55-inch DMD
  • XGA resolution
  • 300 ANSI-lumens
  • Contrast ratio: 2,000:1
  • Life time: 30,000 hrs (typical)
  • HDMI 1.3, USB 2.0 input (HD DivX, File Viewer)
  • Green Technology (does not utilize a Mercury containing CCFL lamp)
  • Wireless FM Transmitter

GET WITH THE TIMES!

I still don’t understand why companies are placing large amount of memory inside their units…  That is one thing (of the several)  that AAXA did right with the M Ultimate-X by ditching the internal memory and going with the fully expandable SD card option. This is a best practice for a lot of reason but the 2 that immediately come to mind are:  the ability to carry multiple cards/ back ups of your work -and- The ease at which you can transfer data to an SD card Vs. mounting a projector to your computer.

The 3M Pocket Projector MP180 offers an attractive range of features, particularly its brightness and ability to store and display images without a computer or video source.

The current top model in 3M’s pocket projector line-up, it delivers the 32 lumen brightness of the 3M Pocket Projector MP160, teamed with the capability of the 3M Pocket Projector MPro150 to project images from its internal memory or a microSD card.

Like the MP160, it is built using an 800 by 600 LCoS chip paired with a set of red, green, and blue LEDs. However, the MP180 offers the extra bonus of the MPro150’s ability to read files from its internal memory as well as from an SD card. But where the MPro150 has 1GB of internal memory, the MP180 offers 4GB – leaving plenty of space for storing pictures and video clips without the need for a computer or video source.

3M has added WiFi connectivity which allows the user to browse the Internet using the projector’s touch screen interface and there is also Bluetooth data transfer.

According to 3M, the projector offers a screen size of up to 80 inches (203cm) and two hours of battery life. 

 

iGo UP-2020 LED Projector

The portable battery maker has released a LED projector called the iGo UP-2020.  Since it is a LED projector, the anticipated life of the lamp is 20,000 hours.  It features 854×480 resolution and built-in media player.  External connections are composite, VGA and mini HDMI.  The LED optical engine is coupled to a DLP imager.

The specs for the LED projector from the manufacturer are:

  • Provides 854×480 pixel native resolution
  • Able to project a viewable screen up to 70 inches
  • Provides 20 ANSI lumens
  • LED source with up to 20,000 hours of life
  • Has built-in media playback function
  • Supports MP4, JPG and BMP files
  • MicroSD card slot & micro USB port
  • Built-in 0.5W speaker
  • Offers composite video, VGA and mini HDMI inputs

In our opinion, this looks like a typical run of the mill LED projector.

Aiptek V50 LED projector


Aiptek PocketCinema V50 LED projector is a is a versatile, high-quality mobile LED projector. DLP technology provides much higher contrast (2000:1) and richer colors. In addition, the V50 LED projector provides a brightness of 50 peak lumens, making it the ideal companion for mobile applications such as business trips, meetings and presentations or privately. The V50 LED projector is also suitable for the rapid slideshow with friends.

The integrated media player allows to playback HD videos, photos and MP3 files directly from SD / SDHC / MMC card or optional USB dongle. All common files like: JPEG, BMP, MP3, WAV, OGG, H.264 and MPEG-4 (.mov, avi, mp4, 3gp) can be play backed directly. The LED projector provides good sound from the internal speaker. PDF and PowerPoint files are converted with the included software on the PC and can be played in V50 with all animations and effects.

The PocketCinema V50 LED projector is a genuine all-rounder. Thus, it can playback photos, presentations and videos directly from SD / SDHC / MMC cards up to 32GB. Data may be prepared and stored on a memory card for your business trip or before the visit of friends and acquaintances. Furthermore an USB memory stick can be connected to V50 to playback media content without the use of an additional memory card.

An interesting feature we find in the V50 LED projector is that is can connect to PC via USB cable.   It can also be powered via USB.

Futuristic Lenses for LED projectors

LED projectors of the future will have little in common with their bulky counterparts today.  Not only will they be small and easy to use, but will also shine so brightly that the images appear sharp and clear, even in a sun-filled room.

Research scientists from Fraunhofer have created a small luminous cube made up of microscopically small nanostructured arrays of lenses that can record or project amazingly sharp images in brilliant colors.

The prototype of the new projector consists of an optical system just eleven millimeters square and three millimeters thick through which a powerful LED lamp shines.

Quoting Marcel Sieler, physicist at the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena “The special thing about the new projection technology is that the image is already integrated in the microoptics. The pixels measuring just a hundred nanometers or so are stored in a chromium layer under the lens array. Such a microarray has around 250 microlenses, and under each lens there is a microimage. When all of them are projected onto the wall together, a high-quality complete image is produced from an extremely small projector”.