I can't find a 10% bulb anywhere. I bought a 48in 8% for my 7 foot cage. If I add a 2% bulb does this help?

does it help? ya, anything extra will help, does it equal a 10.0, i don't know.

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If you are going to buy another bulb I would go with another 8.0.
A 7ft cage? Is this 7ft tall?

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Merlin,
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Why 10? Aren't 8 enough?

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8 is fine, but 10 are better, becuase its no where near what the sun gives off so the highest amount you can get is better.

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As an added boost...along with another high % bulb as suggested (two ReptiSun 10.0s are the typical suggestion for the best UVB using tubes)...attach foil, shiny side out to the back of the light fixture. Allow the foil to curve in an arc. Do NOT follow the sharp angles. By allowing the foil to curve it "collects" the UVB in a tighter field and aims a more focussed and condensed UVB reading onto the iguana...by nearly double the amount (depending upon the surface color of the inside of the fixture, white being the most reflective will give you up to a 22% increase...less reflective will increase this percentage).

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The enclosure is 7 feetx 3 feet x 2 feet

A 10.0 tube will give off UVB up to 2ft giving you more room to work with. The other tubes do not give off UVB effectively at this distance. I believe a 8.0 gives off UVB effectively up to at least 16in but I'm not sure it is not 18in. A 2.0 tube has to be much closer to be effective but I really can't remember how much closer. Since UVB does not pass through glass or plastic and you lose about half your UVB going through screen, the distance the tube is from your animal is important.

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0.0.16 Fishy Friends - misc. tropical fish

That's the first time I hear that... where did you get that info?

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Thats news to me as well.
Flourescent tubes should be no farther than 12 inches from the animal to do any good.
You can't beleive everything an ad says.

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Merlin,
What's Life Without A Little Magic!