LED Module 70 - Hellanor

500Intensity (cd)Intensity (cd)45040050035045030040025035020030015025010020050150Intensity (cd)500450400350300250200150100−40°100−30° −20° −10° 0° 10° 20° 30° −40°50Angle50Hella marine 9599 series LED downlight (Spread)Compared to 8508 series halogen downlight.−40° −30° −20° −10° 0° 10° 20° 30° −40°Angle−40° −30° −20° −10° 0° 10° 20° 30° −40°AngleLED DownlightPower consumption0.8 WattsHalogen DownlightPower consumption10 wattsMaritimo M73 www.maritimo.com.auEfficacyLike efficiency, the efficacy of an LED lampis the amount of light it produces per unit ofelectrical power it consumes (lumens perwatt). The higher the lumens per watt, thehigher the efficiency.E.g. A single Hella marine 9599 series whiteLED downlight consumes less than 0.8W andproduces around 80 lumens. 80 / 0.8 = 100lumens per watt.It may also be an interesting comparison todivide the luminous flux of a lamp by its costto derive lumens per dollar. The more lumensper dollar (flux per bucks), the more light foryour investment.Also, it is important to determine that theefficacy of the LED lamp is measured as thedevices total efficacy, not the efficacy of onlythe LED(s) employed. Power consumed torun an electronic power supply driving andcontrolling the LED(s) is always a contributorto the lamps total consumption.Heat reduction and thermalmanagementWith the power saving benefits of efficientLED based devices also comes heat reductionbenefits. The sometimes dangerously hightemperatures of 10W and 20W halogen lampsonboard can be eliminated with high efficiencyLED technology. This allows boat buildersand designers a wide scope of installationpossibilities where the air cavity behindincandescent lamps, traditionally reserved forcooling, is no longer required. Efficient LEDlamps can be mounted into solid surfaces andcomposite structures without risk of fire orheat damage to surrounding materials.Well engineered thermal management ofan LED device is essential for long-termdurability. A common misconception is thatLED’s do not generate heat. LEDs consumepower and some of this power is alsoconverted into heat, even in the most energyefficient LEDs. In contrast to incandescentlamps however LED’s like to ‘run cold’. Asa rule of thumb, the hotter an LED runs thefaster it will degrade. A lower, and in extremecases much lower light performance willresult.High performance LED’s do generate heat,which needs to be coupled to surfacesdesigned to efficiently transport the heataway from the LED itself. LEDs that overheat,meaning the junction temperature of the LEDrises above a set threshold, will permanentlydegrade and significantly reduce theirluminous efficacy.A noticeably ‘hot to touch’ exteriorsurface of a high output LED interior lampprovides some indication that the lightoutput of the device will deteriorate withina few hundred hours. Hella marine LEDlamps will operate ‘cool’ or ‘slightly warm’to the touch after many hours of operation.61