Question about T5HO lights

[Subrosa]

Originally Posted by estación seca

That's interesting about what is available near you. The hydroponics shops here have moved over the years from HPS to T5HO or CFL and now are mainly selling LED. Aquarium shops here carry T5HO replacements but mostly recommend people move to LEDs. Standard fluorescent lights are scheduled to be phased out over some years, but they're still available.

There has been a resurgence in the use of MH lighting by the more serious keepers of sps corals such as Acropora, particularly in Europe. Quite simply they produce better results in both growth and coloration, as long as you deal with the heat produced. 30 years ago a 20,000°K Radium 400W MH bulb was the gold standard for reef keeping. And it still is.