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post #1 of 7 (permalink) Old 12-09-2003, 01:31 PM Thread Starter
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Hi, I have been hitting the lighting stores again today... looking for PC55s and sockets etc...

Now I am continualy beeing offered small little flourecent tubey thingies which are about 4 inches long with 2 flourecent U tubes (ie 4 tubes)
On the packaging it says 18W = 100W incandecent. HUH?????!!!!!!!!!

The whole kit for 2 of these would have been about $12

Would these be suitable for an aquarium?

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post #2 of 7 (permalink) Old 12-09-2003, 04:56 PM
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Those are the screw in compact Flourescents we always talk about. Yes they are cheap, but they are more of a budget solution, or if you are trying to set up a nano tank.. I'd avoid them if you can.

Their wattage comparison is how they are comparing the lumen output of their bulb to an incandescent bulb. Its a useless indicator for our purpose.
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post #3 of 7 (permalink) Old 12-09-2003, 05:31 PM Thread Starter
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Thanks I saw an interesting page on the Philips website today about their studies into light required by various plants to grow.

They convert LUX units to U-mol i dont know how to make the symbol.
It basicaly seems to be a measure for the amount of energy irradiated.

Typical plants needed about 30 to 50uMol of light for optimal growth.

Now the interesting part is thatin a tubular flourecent 1000 lux is approx. 13-14 µmol m-2s-1

This translates to between 2500 Lux and 3500Lux.
Now I may be mistaken, but I am noticing a trend in lighting suggestions, which would quite often neatly fit this type of profile of hitting the required LUX point (allthough they were trying to get to a certain wattage rather).

Any thoughts corrections on this?

Oh, the link
http://www.eur.lighting.philips.com/...ort/index.html

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post #4 of 7 (permalink) Old 12-10-2003, 11:51 AM
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Their study does not "work" for plants that are under water. Half of the problem we have is getting the light to the plants to start with.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
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post #5 of 7 (permalink) Old 12-10-2003, 12:01 PM Thread Starter
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It would be nice to get some stats on the percentage of light loss (i know some wavelengths have it easier) at difirent depths, say 1' and 2', maybe one could compensatefrom there on.

How many lumens do you have over your tank, per area covered by the bulb? I'm asking cause you have nice plants.

Edit...
I was just thinking that on the smaller tanks the waterfactor would probably not put it that far off (provided it is very clear), once again waiting to get flamed into shape.

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post #6 of 7 (permalink) Old 12-10-2003, 12:48 PM
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There is very little light loss at 1' to 2' of depth. That's why reefers use actinic lights to simulate the light conditions at 15' of depth.
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post #7 of 7 (permalink) Old 12-10-2003, 01:20 PM Thread Starter
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Thanks I will read up on this then...

I always thought those lights are to recreate light levels, say 3' or 4' under the surface...

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