Lighting: How much is too much?

[Kazenouta]

Hey everyone,
So, last week I changed the bulbs in my 15g to CFL 6500k and the difference is absolutely amazing. I'd like to change the bulb in my 5g to a CFL 6500k as well. I have an extra one laying around. It's a 13w bulb that effectively makes 60w of light. With that being said, this will pump approximately 12w/g into my little 5g tank. Is this too much light?

If I instead use a 10w=40w CFL will the then 8w/g be too much light for the tank as well?

:thankyouyellow: for your time

[smaug]

There will be a difference in lumens and light color but for actual output it wont be too much at all.Do you have plants?

[souly]

If your 5g tank is planted...then I'd say got with it...but if not your just asking for algae.

[Kazenouta]

Yes, my 5g is planted with Anacharis. That's one of the reasons I'd like to get the light changed up from the yellow lighting that's in there: for the good of the plant. However, my priority is my fish so, I don't want to harm it with too much light.

[smaug]

That will be a good light.Your fish will be fine.

[souly]

The only light that I know of that is really hamrful to fish is black lights. I've read you can make them go blind by using them.

[Kazenouta]

Thanks for the advice! I gave the extra light bulb I had a try but, it looked way too bright for my taste so, I can only imagine how the fish's eyes felt. It was effectively 60w for a 5g so, I'm going to pick up a 10w=40w CFL tomorrow and see if it isn't better.

Thanks again!