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What's considering medium light? Read the posts here one says it's 30-50 while another says 70 to 150. :icon_conf Maybe I'm just reading it wrong. Anyway what type of light would 2x 14w spiral CFLs give me? My hood has 2 bulb bases in the middle. The bulbs will be in a horizontal position.

This is the bulb I'm considering.
http://www.amazon.com/TCP-TruStart-...UTF8&qid=1355730997&sr=8-5&keywords=tcp+6500k

The light is 12in from the substrate. It's for a 15 gallon tank.
 

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35 - 50 mmol per square inch of PAR would be considered medium light. Not sure where you got the 70 - 150 mmol per square inch numbers from.

Any reflectors?

I would say medium light, given that you are mounting it horizontally, and the likelihood that you don't have a good reflector, etc (loss of light due to restrike).
 

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What's considering medium light? Read the posts here one says it's 30-50 while another says 70 to 150. :icon_conf Maybe I'm just reading it wrong. Anyway what type of light would 2x 14w spiral CFLs give me? My hood has 2 bulb bases in the middle. The bulbs will be in a horizontal position.

This is the bulb I'm considering.
http://www.amazon.com/TCP-TruStart-...UTF8&qid=1355730997&sr=8-5&keywords=tcp+6500k

The light is 12in from the substrate. It's for a 15 gallon tank.
Hi rollinghills,

What size aquarium; what depth to the substrate?
 

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Hi rollinghills,

In my low tech, non-CO2 10 gallon I use 2X 10 watt cfl with good results. I do dose Seachem Flourish Comprehensive and Seachem Flourish Excel as a carbon source.

 

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Look at the meters reading/ units. Looks like it isn't in inches
PAR is usually measured in umol per metre squared per second; the PAR meters in i4x4nMore's and Hoppy's post are measured in the same units.
 
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