# of watts or k for light

[alex061488]

i have 11000k on my small 10g tank i would like to know if this is a good amount or should i add more or what should i do

any info would be great thanks

[Entropy]

Light power consumption is measured in watts
Light output is measured in Lumens
Light effectiveness (usefulness to coral) is measured in Par
Light color is measured in K

So to answer your question you have a good color, but that is all I can tell you without more info.

[alex061488]

i have a good color but is it good for corals what is a good light for corals in a 10g tank

[ganjero]

How many watts? what type of light is it? what are you planning to keep?

[armagedon48]

i assume your using T8 or T12, as these are most common at most every fish store. i think 4 T8s over a 10 gal will keep most low-med light corals. which is about 60 watts.
80 watts of Power compacts over a 10 gal is also fine for low-med light corals, i even have montipora growing under these lights.
if you really want to keep ANYTHING, go with a 70 watt or 150 watt metal halide (go with 70 watt if you dont have a sump/chiller). OR go with T5, though the shortest i think are 24 inch tubes, a bit of a overhang on a 10 gal.

with normal HO florescence, aim for 60-100 watts (which may be difficult with a 10 gal). also, 10k-14k are good color temps
with Power Compacts, id go with 80watts. there is a fixture made with a 40 watt sun and 40 watt actinic which works fine.
T5 or Halides go for 70 watts-175 watts for intense lighting.

i think i got my info right, and remember the the Watts Per Gallon rule is very old. its more of a general guideline than a rule. if all lights were the same, then we could use the WPG rule, but they aren't so its fairly useless.