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Blue light is the portion of the visible light spectrum with the shortest wavelength and highest energy. There is a high amount of blue light, especially in LED lights. They are emitted through mobile phones, tablets, computers, and TVs which are harmful to your eyes. 

it is also known to stimulate the production of melanopsin, a hormone in our eyes to stimulate alertness. LED light source from our daily usage of technology gadgets contain a significant amount of blue lights and the concern is that excessive usage during the evening and night hours will cause our bodies to continue the production of melanopsin that results in harmful effect to our health.  

As the day gets darker, our bodies will naturally expect the emission of blue light exposure to diminish. But by continuing to use LED devices, we are altering the natural biological clock in our bodies which could pose severe health problems in the long term. 

Harmful Effects: 

  • Low Attention Span 
  • Visual Fatigue 
  • Body Fatigue 

How to prevent yourself from the harmful effects? 

  1. Decrease LED light intensity by sitting further away from devices or using them at a further distance. 
  2. Decrease the duration of time exposed to LED light. 
  3. Avoid using devices late at night just before going to bed for your eyes to have ample rest. 
  4. Choose the safe source of LED bulb which allows you to use them even during evening and or late night. 

How to choose a safe source of LED bulb? 

When it comes to choosing the right type of LED bulb, you need to look for LED bulbs that provide more red energy and less blue energy. Blue light has the shortest wavelength while red light has a long wavelength. 

  1. Choose a LED bulb with colour temperature of 2700k and lower or preferable 2400k. The light bulbs are usually labelled as ‘warm white’. Avoid LED bulb that is above 3000k colour temperature. They are usually labelled as “bright white”, “neutral white”, “cool white” or “daylight white”. These light sources generally have a crisp, stark white colour. LED bulb with this light colour contains a significant amount of blue light which are damaging to our eyes.  
  2. Choose LED bulb with a high CRI (Colour Rendering Index). Higher CRI indicates less blue light and more red light 

Do pay extra attention to the LED bulb specifications when purchasing one. You can always safely integrate LED lightings in your home without having negative health effects from the ‘blue light hazard’

Graphic showing the difference in colour temperature. The warmer the light, the lower the colour temperature is. 2700k and below colour temperature will let you feel relax. 

In layman term, blue light is like caffeine, you wouldn’t want to double-shot expresso an hour before going to bed!