Luminous intensity is dark.

Is the countermeasure of surge voltage generated by the On/Off status change done?

Are electrification prevention and electrical discharge prevention done during operation?

Is the absolute maximum rating defended?

Is the straight protective resistor put for stable operation?

Did you use LEDs with the matrix circuit?

Is the driving current used by 2mA or less?

Is the applied voltage lower than the forward voltage?

Do you use LEDs in outdoor?

When you solder twice, do you do in the leaving time of the product after opening moisture-proof pakaging ?

Does leaving time of products meet the recommended condition after opening moisture-proof packaging?