The care articles on this site are excellent:
http://www.herpcenter.com/a/
This article is excellent for UVB lighting. It also explains how fluorescent UVB tubes should be set up.
http://www.cyber-ig-info.netfirms.com/uvb_light.htm
This is a diet I follow for my iguanas. I usually use 4-7 different greens but I like greens and can eat what will go bad too soon.
DIET :
An iguana's diet should contain the following each day:
70-80% calcium rich greens: Collards, mustard greens, turnip greens, dandelions, arugula, watercress are the better ones. Kale, beet greens, chicory greens and escarole used in combination with the better greens are also good. Stay away from lettuces (except for a very occasional treat) because they have very very little nutrition if at all and the iguana will fill up on it and not eat the nutritional food--in other words it is junk food. Spinach should only be used occasionally because it is way too high in oxalates and phosphorous. The oxalates bind with the calcium making it indigestible and the phosphorous binds with calcium in the blood making the calcium there useless. But spinach is high in iron so it is good if only used very occasionally (1-2x a month maybe).
20-30% vegetables: Winter squash (acorn, butternut, kabocha, ect..), green beans, snap peas, okra, parsnip, yucca root. Summer squash (zucchini, yellow, Mexican or white, ect...) occasionally is good too. Red, yellow, and orange bell peppers are good color enhancers.
No more than 10% fruit: Blueberries, figs, mango, papaya, and prickly pear (cactus) are the better fruits. Strawberries, raspberries, black berries and melons are good. Flowers should be considered a fruit
percentages based on volume
ABSOLUTELY NO ANIMAL PROTEIN OR BY PRODUCTS
Rep-Cal Iguana food soaked is a recommended supplement that helps
**appetite--the color and smell seems to increase their appetite
**hydration--the pellets act as sponges, they soak up twice their volume of water
**regularity--the increase hydration help keep things moving
**mineral/vitamin supplements--no other supplements are needed other than a probiotic
Use 1-2 tablespoons for an adult iguana. A teaspoon for a baby iguana. Soak it in water for about 5 minutes--it will be about twice the size after soaking. Sprinkle this over the greens/vegetable diet.