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Re: What's people's views/experiences with metal halides.... If you get it you might want to get a PAR meter to help you hang it at the right level. It will need to be at least 20cm above the water surface anyway to avoid excess water heating and to ensure sufficient spread of light. Do they...

Re: What's people's views/experiences with metal halides.... Hi Alistair, Advantages with Halide - units look great, brightest lighting available, choice of Kelvin and spectrums, glitterlines, point source. Disadvantages - Heavy to hang from ceiling, expensive to run, heat, glare, can be...

Prospective TMC tile buyers may also want to consider the 1500 XG Ultima tiles. They are 9000K, 27 watts instead of 30, yet are even brighter. When launched they were the most energy efficient LEDs on the market.

Thanks for offering out the PFK PAR meter George LOL! I think you may have already bought them tony, but you won't need six tiles for a five footer. Four will be fine.