PFO LED lighting

[G1GY]

Originally Posted by midgetwaiter

The radiant heat transferred by the photons striking a surface is not a significant concern and will almost completely be nullified by evaporation at the water's surface.

Air is a shitty heat conductor and pushing it around with fans doesn't work very well. For example, this is why big transformers are submerged in oil.

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While air is not a good heat conductor, you can only saturate a given amount of air with water untill the air can't hold any more. A fan will move the wet air away and allow more dry air to become saturated during evaporation. Without doing this.............. evaporation (and free cooling) stops. (This is in the case of the aquarium itself.)

As far as the fixture itself:

While air itself is not a good conductor, moving it over a heated surface does provide an excellent cost effective vehicle to move heat away from the fixture.

Yes big transformers are filled with with oil for cooling, but the outside of this oil filled gallery is also designed as a heat sink(Largest surface area possible in a given space.) to transfer the heat from the oil to............... You guessed it! Air.

[jess]

I'd really like to see the spectrum of light they put out. Generally LED's have a very narrow frequency band for each colour. I wonder how many different colours they are using in the light.

Halides should have a much broader frequency band.

[TheReefGeek]

How exactly does it use 40% less energy?

The new PFO fixture is 300w

This is supposed to be comparable to a 250w MH setup.

Seeing as I pay for electricity by the Kilo-watt-hour, if I run both these fixtures ofr 10 hours a day, won't the PFO cost me MORE?

What am I missing?

[jess]

From a pure power usage point of view your right, they won't make much of a difference on the electricity bill if ran for the same amount of time. I'm not sure how the MH are rated but assuming that the bulb is using 250W and then assuming the ballast has an 80% efficiency then the actual input power to the MH balast should be around 300W anyway.

MH obviously lose alot more power to heat generation through the light and ballast than LED's. So on a Watt vs Watt basis the LED lighting should produce more light output and less heat output due to it's high efficiency. I'm no lighting expert by any means but what worries me is the narrow spectrum of light produced by LED's.

The 300W LED light should run quite a bit cooler which is a nice bonus.

I'm sure someone else here has a better explanation.