Planted Aquarium Lighting

Do aquarium plants only use red and blue light? Not quite. Green light drives photosynthesis deeper in the leaf than most hobbyists realise. Here's the light spectrum planted tanks actually use, why PAR and PPFD matter more than lumens, and where "PUR" marketing falls apart.

Choosing a planted tank light means cutting through diode counts, wattage claims and "full spectrum" labels. This guide ranks today's LED options by what reaches plants at the substrate, from premium RGB fixtures to budget bars, and shows how to match output and spectrum to your tank.

Twinstar S Series III sits at the performance end of Twinstar's lineup. It tends to be discussed mainly in terms of aesthetics and spectrum quality - less often in terms of raw output. This article looks at both, along with a practical PAR reference table based on our own measurements.

Most aquarists buy the brightest light they can afford, run it at full power from day one, and then wonder why the tank looks like a crime scene two weeks later. PAR is the only number that matters. Watts, lumens, and "full spectrum" stickers are not your friends. Here is where to start.

Reducing your photoperiod hasn't stopped the algae, and longer hours aren't producing better plants. Here's what sets the right light duration for a planted tank: why 7 to 10 hours suits most setups, when to run less, and why intensity and stability matter more than the number on the timer.

There is a widespread belief that 6500K is the optimal value for photosynthesis in planted tank. Is this true?