Thanks for responding! I am specifically referring to brightness, not uvb, so it sounds like your tank is very bright next to the windows and with the addition of the halogen lamp. I have the same uvb and basking lamp as you do (although the latter is 150Win my case..it is colder here). I havent added led yet but I am seriously considering it.
I have, in fact, two of them: 100 W + 100 W.
What I see very much in the reaction of my dragon:
- If the weather is just slightly (!) worse, means outside temp 2 - 5 degrees lower, or a bit of haze, my dragon stays in a cave the whole day.
- If one of the lamps fails, he stays in the cave until the lamp is replaced, unless it is a super bright day.
The sun can be seen through the two windows all day long, starting with sunrise at one to sunset at the other one.
(Regarding lamps failing and being replaced: Of course I do so as soon as possible, and despite lamps being hard to get here, I got me some from abroad and now keep a 1-year-supply at minimum.
Some hours without lamp just happen, nevertheless. For example, yesterday one failed, it was early in the morning and I instructed my husband to get a new one from the basement compartment and screw it in as soon as he's up (he sleeps longer, I leave super early, I told him and left him a note). He forgot... Dragon was in his cave all day long. I screwed the lamp in late evening so it switches on in the morning: Dragon out of his cave 6am, munching golliwog plant!)