Lighting question

[Darkness]

I found an old ten gallon hood in my parents garage, and it holds in two crew in lights, It says that the maximum lighting is two 40 watt lights. So my question is these damn new compact fluorescents. I have two sitting here that say they are 13 W/ a 60 watt replacement, because they use as much energy as a 13 watt light but are as bright as a 60. So which of these numbers am I supposed to go by when calculating if there lights are too high or not?

I'm gonna try to go to a hardware store and find some 4 ft fixtures anyways, so maybe it won't be an issue, but it bugs me that these packages post two different wattages.

[RobbieG]

The amount of watts it uses (13) is the one to go by for deciding if it is OK for the fixture.

[sergo]

the light output (lumens) of flourescent bulbs and incandescent bulbs don't compare because of the style of bulbs being used. flourescent bulbs use a high wattage ballast to power the bulb but only consume x watts through the ballast and are quite efficient whereas regular bulbs are not efficient energy users and actually consume more watts.
the reson why they post 2 different number on the package is you can have something to gauge the brightness against.
did i explain that good enough?

[hungryhound]

it bugs me that these packages post two different wattages.

As robbie said the number that matters is the first number. Since compact flourescents are nnew most consumers do not know what the relative light level is per watt. The second number is placed on the packaging to allow consumers to compare incandescent to compact fluorescent.

[Darkness]

So when it comes to figuring out watts/gallon, do i go by 13 or 60,

[sergo]

you can't do that with incandescent bulbs only flourescent.
use 13.

[Darkness]

ok thats what i thought, thanks for the help