Brightness matters. You should try to reach approx 100 000 Lux under a asking spot. With fluorescents or mercury vapor, no chnace to exceed 5-15000 Lux.
With metal halides, no problem to reach naturla light intensities at a sun like spectrum at a basking spot.
I do use metal halides in all my tanks for diurnal animals and so do most european herpers. For my basilisk setup, I have comined 2 T5 28 W fluorescents with 2 x 70 w and 1 x 150 w mwtal halide (CDM-R and HCI). Plants grow well and lizards are brilliantly coloured.
Only with metal halides, most lizards easuly reach the same colour intensity as in the wild.
Before I forget aout it: For an adult WD, you should use an enclosure od at least 5 x 3 x 6 ft. In too small enclosures, they also often stay dark-its a stress issue then.

BR

INgo

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