Understanding light intensity is crucial when using artificial lights for your houseplants, as it directly impacts plant growth and development. Here are some important points to consider about light intensity:

1. Measurement: Light intensity is typically measured in units called foot-candles (fc) or lux. Foot-candles measure the amount of light received by a surface located one foot away from a light source, while lux measures the same at one meter. The higher the foot-candle or lux value, the more intense the light.
2. Plant light requirements: Different plants have varying light intensity requirements. Some plants, such as succulents or cacti, prefer high light intensity, while others, like ferns or snake plants, tolerate lower light levels. Understanding the specific light requirements of your plants is crucial for providing optimal growing conditions.
3. Light distance: The distance between the light source and the plants can significantly affect light intensity. As you move a light source closer to the plants, the light intensity increases. Conversely, moving the light source farther away reduces light intensity. Consider the recommended distance for the specific light you are using and adjust accordingly to achieve the desired light intensity for your plants.
4. Light distribution: Light intensity is not evenly distributed from the light source. The intensity is highest directly under the light and gradually decreases as you move away from it. This means that plants positioned closer to the light source receive higher light intensity, while those farther away receive less. Rotate or reposition your plants regularly to ensure even light distribution and prevent uneven growth.
5. Plant response to light intensity: Plants respond to light intensity in different ways. Higher light intensity generally promotes more compact growth, stronger stems, and increased flowering or fruiting in flowering plants. Insufficient light intensity can lead to leggy growth, elongated stems, and reduced flowering or fruiting. Monitoring your plants’ growth and adjusting the light intensity accordingly can help ensure healthy development.
6. Light duration: While light intensity is important, so is the duration of light exposure. Most houseplants benefit from 10 to 12 hours of light per day. Some plants may require shorter or longer periods of light exposure, depending on their specific needs and growth stage. It’s important to strike a balance between light intensity and duration to avoid overexposure or insufficient light.
7. Light measurement tools: Light meters, also known as lux meters or foot-candle meters, can help you accurately measure light intensity. These devices allow you to determine the actual light levels in your space and adjust the position of lights or plants accordingly.

By understanding light intensity and its impact on plant growth, you can select appropriate artificial lights, position them at the correct distance, and ensure your houseplants receive the optimal light levels they require. Regular monitoring and adjustments based on the specific needs of your plants will help you create a suitable environment for healthy and thriving growth.