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Optoelectronics/Displays??

Replace inefficient MR16 halogen lamps with LEDs

Posted: 28 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Halogen lamp? LED? lighting application?

Halogen MR16 lamps are widely used in professional store and home decorative lighting applications, though they have several disadvantages that limit their potential. The power dissipation of the most commonly used halogen MR16 lamps ranges from 10W to 50W, and their light output ranges from 150 lumens (lm) to 800lm. That equates to an efficacy of about 15lm/W, or a luminous efficiency of 15 percent. The lifetime of a typical halogen bulb is limited to about 2000hrs. Additionally, the filament should not be exposed to high levels of vibration to prevent the bulb from failing prematurely.

Using a driver circuit based on a specialized buck controller, a white LED with an integrated heatsink can replace a 10W halogen bulb in MR16 lamps, eliminating the concern for the halogen lamp's shortcomings.

Today's LED technologies offer an MR16-compatible, solid-state, cost-effective alternative to halogen lamps. For example, the latest generation of 5W (single-chip, 4mm x 4mm package) and 10W (four-chip, 7mm x 7mm package) high-power LEDs from LedEngin generate typical efficacies of 45lm/W at 1000mA with a junction temperature (TJ) of +120C. Under actual operating conditions, these specifications equate to typical lumen output levels of 155lm (at 1000mA, TJ = +120C) for the 5W package and 345lm (at 700mA, TJ = +120C) for the 10W package. When these LEDs perform at the same brightness level as halogen bulbs, power dissipation can be reduced by about 50 percent. In addition, LedEngin predicts a remarkable lumen maintenance of 90 percent (at 100khr, TJ = +120C), thus eliminating the need for bulb replacement throughout the life of the product.

View the PDF document for more information.




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