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Just had to put 2 cents in on exo-terra 5.0 cfl (and any UV B emitting light)
They could give off too much UV for frogs in a small set ups or if not used carefully. (!!!)
You have to remember... frogs don't really bask and "sit" the recommended
exposure distance from those bulbs like the pretty box pictures show of the bearded dragon stretched out exactly 12 inches under the bulb.
(Thereby getting his correct UV dosage to cheerfully synthesize his Vit. D for the day and making his pineal gland in his brain under his 3rd eye happy.)
Thumbnails especially could climb up the sides and get/sit too close to the bulb.
Also, as noted above...some UV cfls don't put out much light. Because a higher percentage of their energy is spent putting out rays in the invisible (to humans) UV A and UV B spectrum.
My personal opinion is that ALL UV B producing CFLs should be used in conjunction with another form of full spectrum lighting to boost up the lumen levels / lux / overall enviromental brightness.
There is a debate around this whole matter because the lumen output is low on some UV B cfls, hence... the animals pupils don't constrict enough as they would in natural brighter sunlight, to thus limit the amount of UV hitting their retinas.
In other words, in close proximity, there eyeballs could get over UV-ed. Like when they sit 2 inches under the bulb up on the glass.

Having said all that, I DO use UV cfls on timers in conjunction with other lighting on my variabilis, with precautions.:D
(Mini tanning goggles.I have invented them for frogs.)


PS. Solarmeter = good, very Good to measure UV levels.


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557 Posts
On a side note, Some of the fixtures I have been looking at have the blue actinic bulbs, are these something that I should run also? I thought those were for coral tanks?
Yes, you hit the nail right on the head: for coral tanks.
You see, the actinic bulbs are blue to mimic sunlight filtered through 20 - 30++ feet of sea water. Water naturally absorbs red wavelengths of light and transmits blue. (Hence... the sea appears blue :))
The blue shift of those actinic bulbs provide very natural light for saltwater fish and corals.
Since most T5 fixtures are marketed for reef tanks, they come with at least one blue actinic bulb.
However, they are UNnatural light for any terrestrial animal and should be replaced with a good full spectrum daylight bulb. 5.4K - 7-ish k.
You could always sell them off on e-bay or trade them for something good with someone who has a reef tank :D

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557 Posts
Ok another question, The fixture that I am almost ready to pull the trigger on has 4 10000K bulbs. Is 10000k too much? I also found one that has 4 6500k but it is a little longer of a fixture, maybe I can my 12x12x18 exo next to my 18"cube and light them both....thoughts??
10K would be a cool crisp white light. It would be ok.
But remember, natural sunlight is 5.5K to 7K.
Google spectral curve and color temperature of sunlight.
That is the template you(we) are all shooting for.
Good 'ol natural sunlight. Nature. You can't impove on it.
Honestly, I would get the fixture you like that fits. You can always swap out a 10k bulb or 2 of 'em for some 6.5K ones. The bulbs for T-5's themselves should all be the same standard size.
Cheers! Todd
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