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(6) Heat Generation

· Thermal design of the end product is of paramount importance.

Please consider the heat generation

of the LED when making the system design.

The coefficient of temperature increase per input

electric power is affected by the thermal resistance of the circuit board and density of LED

placement on the board, as well as other components.

It is necessary to avoid intense heat generation

and operate within the maximum ratings given in this specification.

· The operating current should be decided after considering the ambient maximum temperature of LEDs.

(7) Cleaning

· It is recommended that isopropyl alcohol be used as a solvent for cleaning the LEDs. When using

other solvents, it should be confirmed beforehand whether the solvents will dissolve the resin or not.

Freon solvents should not be used to clean the LEDs because of worldwide regulations.

· Do not clean the LEDs by the ultrasonic. When it is absolutely necessary, the influence of ultrasonic

cleaning on the LEDs depends on factors such as ultrasonic power and the assembled condition.

Before cleaning, a pre-test should be done to confirm whether any damage to the LEDs will occur.

(8) Safety Guideline for Human Eyes

· The International Electrical Commission (IEC) published in 2006 IEC 62471:2006 Photobiological

safety of lamps and lamp systems which includes LEDs within its scope. Meanwhile LEDs were

removed from the scope of the IEC 60825-1:2007 laser safety standard, the 2001 edition of which

included LED sources within its scope. However, keep in mind that some countries and regions have

adopted standards based on the IEC laser safety standard IEC 60825-1:2001 which includes LEDs

within its scope.

Following IEC 62471:2006, most of Nichia LEDs can be classified as belonging to either Exempt

Group or Risk Group 1. Optical characteristics of a LED such as output power, spectrum and light

distribution are factors that affect the risk group determination of the LED. Especially a high-power

LED, that emits light containing blue wavelengths, may be in Risk Group 2.

Great care should be taken when viewing directly the LED driven at high current or the LED with

optical instruments, which may greatly increase the hazard to your eyes.

Nichia STS-DA1-0157A

<Cat.No.080926>