Jack,
Hate to say it but you're information is way off and it seems like you've totally misinterpreted your book. To begin with, I'm citing scientific studies published in various biological journals, not a general chameleon husbandry book. I would recommend you go read the following articles:
Ferguson, G.W., Gehrmann, W.H., Chen, T.C., Dierenfeld, E.S. & Holick, M.F. (2002). Effects of Artificial Light Exposure on Reproductive Success of the Female Panther Chameleon (Furcifer pardalis) in Captivity. Zoo Biology 21: 525-537.
Lindgren, J. (2004). UV-lamps for terrariums: Their spectral characteristics and efficiency in promoting vitamin D3 synthesis and UVB irradiation. Herpetomania 3-4:13-20.
Let me quote a few lines of that may be of interest to you.
"Some commercially available, low-intensity, UV-generating fluorescent tubes can provide adequate amounts of UVB in indoor artificial-light set-ups if used properly. Some may also provide too much UV if irradiation is provided for too long a period." (Ferguson et. al)
"The use of high UVB-generating fluorescent tubes can be harmful to the lizards and the keeper and as such are not recommended." (IBID)
"UVB requirements for juvenile and adult male panther chameleons are lower than those for adult females." (IBID)
"Female panther chameleons are attracted to UV light, and it they are provided with a light gradient containing a substantial component of UVB they appear to be able to adjust their exposure based on dietary vitamin D intake. However, they may not be able to photoregulate effectively in an artificial UV gradient that provides too strong a UVB irradiance." (IBID)
"While short exposure to high UVB-emitting sunlamps also promotes successful reproduction, extended use shortens the reproductive longevity of the adult chameleon, can promote skin tumors and shorten the life span of the chameleon (personal observation), and is potentially dangerous to the keper." (IBID)
"Of all the lamps measured, the best contributor to vitamin D3 photosynthesis in skin is Zoo Med ReptiSun [5.0], with a D3 Tield Index of 439." (Lingren)
Now, higher intensity bulbs with longer radience distances are great when the animals are provided a sufficient UV gradient. In the vast majority of enclosures, they are NOT and as a result, use of these high level irradience bulbs is dangerous, regardless of whatever preceived color improvement you might think you see.
Chris