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Discussion Starter · #1 ·
hello,
This is my second attempt at this post (i am a newby and the first one must have gotten lost in cyber space; perhaps had something to do with forgetting to title it)
I thought i would share a little description of a vivarium i put together about a month ago. The tank is roughly a 24" cube and has a group of four pumio in it. I originally had it lit with a twin 55 watt compact fixture and thought it was doing pretty good but after taking a fc reader and comparing to dappled sunlight outside i realized how dark even a "well-lit" terrarium actually is. So I dug out two 175 watt MH pendant fixtures and put them in the back and slid the twin 55's to the front. I know what you all are thinking 460 watts of light for a 24" cube is overkill. Well, yes it is that is why I routed the two MH fixtures through a digital temperature controller with the probe at the upper portion of the terrarium. When the temp at the top of the viv reaches 86 degrees the MH lights cut off leaving just the compacts running until the temperature drops 4 degrees and the MH lights cut back on. The effect is a somewhat random "sun-fleck" throughout the day accompanied by temperature fluctuations. I have a fan blowing across the top of the terrarium but even with that the tank overheats roughly every hour and a half, and that is dependant on outsides temps, if i am using the oven, or if the sun is hitting the windows....so far the plants are going nuts and the pumilio are getting ready to move their first clutch of tads to nice red bromeliads. The temperature drops to about 72 over the night and then the chaos starts up again. Ben
 

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How about trying just one MH fixture centered over the tank? They have an approximately 24" spread in all directions, so that should sufficiently light your cube, while also keeping the temp down. How far above the tank is the MH light?
 

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Discussion Starter · #3 ·
Well i guess i made the post to question the term "sufficient". I wanted for the temperatures to reach the upper limit and I wanted for there to be on and off episodes and I wanted for there to be a very bright enclosure. Going to a single 175 would kinda defeat the reasoning behind why I built the terrarium. I wanted to place some stress on the frogs and to also break up the monotony of constants in light intensity and position. Now it may come to me resetting my temp thresholds, I have already thought about maybe running the two 175s and temp controller through a seperate timer such that it does not become active except between like 11-4, but that is dependant on how the frogs behave. Oh the MH lights are about 3 inches above the tank top. ben
 
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