Moonlights completed!

[sly]

My fan is blowing cool air into the hood and out the other side. I can't mount the fan to blow across the water because I have a glass cover.

 

[asbury030]

im puttin fans on my 29 So should i have both blowing in?

 

[007]

I actually just recently learned that yes indeed you do want your fans blowing IN.
The reason being that blow cooler, drier, air into the airspace of the canopy facilitates evaporation from the tank . . . the evaporation is what cools the tank . . . NOT the fans.
Learnin' all the time around here . . . all the time.

 

[crm13]

I also agree with fans blowing cold air in and the other doing the same. You can also move a larger volume of cooler air per time period than you can of warm air, so theoretically the fans would be working more efficiently. Same theory is used in audio amplifier designs.

 

[crm13]

Sly, I was wondering I noticed that you use 150 ohm resistors to drop the voltage across each l.e.d. Where did you get that figure from... how did you know that 150 ohms was the right value to drop the voltage to the correct value for the led?

 

[sly]

I read it off another website and trusted that the value was correct.
And it was...

 

[crm13]

Then in turn, I will trust you as well. I'm gonna try that out on my planted tank. (I got the pc with the ones built in on my salt tank.)