Light Purifies

But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus, his Son, purifies us from all sin. 1 John 1:7 NIV

Light purifies. Light can be used as a purification method in several ways, depending on the context and the substances or microorganisms you want to purify. Here are a few common ways light is used for purification:

Ultraviolet (UV) Sterilization:

UV light is commonly used to disinfect and sterilize air, water, and surfaces. It works by damaging the DNA or RNA of microorganisms such as bacteria, viruses, and protozoa, preventing them from replicating and causing infections.

UV-C light with a wavelength of around 254 nanometers is the most effective for disinfection purposes. UV sterilization is commonly used in water treatment plants, air purification systems, and medical equipment sterilization.


Photocatalysis is a process in which light, usually UV or visible light, is used to activate a catalyst to degrade organic pollutants in air or water. Common catalysts include titanium dioxide (TiO2) and zinc oxide (ZnO).

When these catalysts are exposed to light, they produce highly reactive oxygen species (ROS) that can break down organic compounds, such as pollutants and contaminants, into harmless byproducts.

Solar Disinfection (SODIS):

SODIS is a simple and low-cost method of water purification in which water is exposed to sunlight in clear or transparent containers. The UV radiation and heat from the sun can kill harmful microorganisms in the water, making it safe to drink.

This method is often used in areas with limited access to clean drinking water and is effective in reducing the risk of waterborne diseases.

Laser Ablation:

In some advanced purification processes, high-intensity lasers are used to remove contaminants or unwanted materials from surfaces. Laser ablation involves focusing a laser beam on a target material, causing it to vaporize or disintegrate.

This technique can be used in applications such as removing paint from surfaces, cleaning delicate materials like artwork, or purifying semiconductor wafers in electronics manufacturing.

Optical Sorting:

Light-based sorting systems are used in industries like recycling and agriculture to purify materials by separating them based on their optical properties. For example, optical sensors can detect and sort materials by color, size, or shape.

In recycling, this technology is used to separate different types of plastics or to remove contaminants from recyclable materials.

In each of these cases, light is harnessed for its specific properties, such as its ability to disinfect, break down pollutants, or facilitate sorting and purification processes. The choice of method depends on the intended application and the nature of the contaminants or substances being purified.

Just as physical light purifies objects, the light of Jesus purifies us. As we walk daily in the light, we become purified. We become changed from the inside out. Our character becomes more like His.

Keep walking in the light of Jesus.

–Diane (

Written by Diane Levy


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