Disadvantages of using traditional LEDs

High price:

LEDs are currently more expensive, price per lumen, on an initial capital cost basis, than most conventional lighting technologies. The additional expense partially stems from the relatively low lumen output and the drive circuitry and power supplies needed. However, when considering the total cost of ownership (including energy and maintenance costs), LEDs far surpass incandescent or halogen sources and begin to threaten compact fluorescent lamps.
Luminanz technology uses the latest high brightness LEDs in an extremely efficient way meaning that less LEDs are needed and hence making lights competitive with traditional sources.

Temperature dependence:

LED performance largely depends on the ambient temperature of the operating environment. Over-driving the LED in high ambient temperatures may result in overheating of the LED package, eventually leading to device failure. Adequate heat-sinking is required to maintain long life. This is especially important when considering automotive, medical and military applications, where the device must operate over a large range of temperatures, and is required to have a low failure rate.

The efficient use of high brightness LEDs means less heat build up, coupled with efficient thermal management ensuring optimum performance.

Voltage sensitivity:

LEDs must be supplied with the voltage above the threshold and a current below the rating. This can involve series resistors or current-regulated power supplies.
Luminanz never run their products at more than 350 mA to ensure optimum balance of power consumption, operating temperature and life expectancy.

Light quality:

Most cool-white LEDs have spectra that differ significantly from a black body radiator like the sun or an incandescent light. The spike at 460 nm and dip at 500 nm can cause the colour of objects to be perceived differently under cool-white LED illumination than sunlight or incandescent sources, due to metamerism; red surfaces being rendered particularly badly by typical phosphor based cool-white LEDs. However, the colour-rendering properties of common fluorescent lamps are often inferior to what is now available in state-of-art white LEDs.

Luminanz uses the latest LEDs and mixes light within the fitting before it comes out of the fitting, this enables us to produce all variations of colour temperature and colour rendering.

Area light source:

LEDs do not approximate a “point source” of light, but rather a lambertian distribution. So LEDs are difficult to use in applications requiring a spherical light field. LEDs are not capable of providing divergence below a few degrees. This is contrasted with lasers, which can produce beams with divergences of 0.2 degrees or less.

Luminanz has found the solution to this issue and can produce spherical light fields and can adjust beam and spread angles to suit required application.

Blue hazard:

There is increasing concern that blue LEDs and cool-white LEDs are now capable of exceeding safe limits of the so-called blue-light hazard, as defined in eye safety specifications such as ANSI/IESNA RP-27.1-05: Recommended Practice for Photo biological Safety for Lamp and Lamp Systems.

Luminanz’s technology uses LED light indirectly; this avoids contact with the eye and therefore provides a safe and efficient light output.

Blue pollution:

Because cool-white LEDs (i.e. LEDs with high colour temperature) emit much more blue light than conventional outdoor light sources such as high-pressure sodium lamps, the strong wavelength dependence of Rayleigh scattering means that cool-white LEDs can cause more light pollution than other light sources. It is therefore very important that cool-white LEDs are fully shielded when used outdoors.

Compared to low-pressure sodium lamps, which emit at 589.3 nm, the 460 nm emission spike of cool-white and blue LEDs is scattered about 2.7 times more by the Earth's atmosphere. Cool-white LEDs should not be used for outdoor lighting near astronomical observatories.

Luminanz technology uses the light in a fully-shielded way to minimise Blue pollution.