Originally Posted by dastowers
Hoppy thanks so much! I honestly was very pleased you answered my question.
I would like to have the lights a foot above the tank for ease of access. The LED have always interested me but were too expensive until I found a link to :
Freshwater Planted Tank Lights - What width of light do I choose for an 18 inch wide tank with the lights hung a foot above? Was looking at two 36 inch one with the suspension kits.
These are 250 WATT METAL HALIDE PENDANT LIGHT FIXTURE [PEND250W]
Would two or three work best if I chose those? I really like the look of pendants but would the energy saving of the LEDs be better in the long run?
With this combo of led's you'll get a high color rendering index ( CRI ) of 91 at 5500K color temperature. The standard against which all lighting is measure is sunlight with a CRI of 100.
660nm Deep Red
If you can wait the owners are going to include cyan led's soon. This will fill in the led *blue gap all white light leds have at this time and at the same time improving the CRI.
MH lights are very hot and will cost you money in electricity usage.
P.S. Adding green led's does increase the apparent brightness because human vision is most sensitive to those wavelengths.