Tack du efter att läst det hela så är väll saken biff. Man är ändå ute efter lummen styrkan ju.. T5's have a higher lumen output than a VHO, generate less heat, and are more energy efficient. It has also been reported that T5's last considerably longer, between 2-3 years, with less degrade in lumen output. At only 5/8" in diameter, more bulbs can fit under your tank's canopy.