The ‘T’ in both T5 and T8 lighting stands for tubular, and the number represents the diameter of the bulb in 1/8 inches.
- T5 bulbs are 5/8 inch in diameter.
- T8 bulbs are 1 inch in diameter.
T5 Lighting:
- Higher output compared to T8, which makes it suitable for more advanced setups.
- Energy consumption is higher, meaning running costs can be 3-5 times more than T8 bulbs.
- Ideal for advanced planted freshwater tanks and reef saltwater aquariums.
- Provides more intense light, which is essential for coral growth in reef tanks.
T8 Lighting:
- Lower output and more common in basic aquariums.
- Lower running costs, making it more economical for general use.
- While T8 can still be used in reef tanks, they are less effective for coral growth, especially for hard corals.
What Do the Different Coloured Bulbs Do?
Aquarium lighting bulbs come in various colours or spectrums, and each type serves a specific purpose in promoting a healthy aquatic environment:
- White bulbs (typically around 6,500K): Provide a balanced light and simulate natural daylight. They promote plant growth and can be used in freshwater tanks or general setups.
- Blue bulbs (actinic, around 10,000K): These bulbs simulate deeper ocean light, providing a blue hue that enhances the appearance of your aquarium, especially in saltwater and reef aquariums. They help in promoting coral growth by simulating the blue spectrum light that corals need for photosynthesis.
- Red and Pink bulbs: These promote plant growth by providing the red spectrum that is essential for photosynthesis, especially in planted freshwater aquariums.
- UV (Ultraviolet) bulbs: These enhance coral colouration and are often used in reef aquariums to promote coral health and fluorescence.
Choosing the right coloured bulb helps in creating the right environment for your fish, plants, and corals, and also impacts the overall aesthetic of your aquarium.