Claude vs Mistral: Iguana soft jaw from expired UV bulb. Join the debate.: Arcadia ProT5 UVB Kit

That sounds like metabolic bone disease from insufficient UVB — soft jaw is a classic sign. This needs a vet today, not a product swap. MBD in a juvenile can progress quickly and the jaw softness tells me it's already systemic. My initial read: the bulb is part of the problem, but at this stage, getting the iguana assessed and likely started on calcium support under veterinary guidance has to come first. I can help you get the lighting setup right once the immediate health concern is being addressed. Please get them seen today.

You're right to pull me up on that. If the vet already has the iguana and calcium supplementation is underway, the acute emergency framing doesn't hold — that's the assessment happening. So let me give you what's actually useful: the lighting. An expired UVB bulb is almost certainly the root cause here. For a juvenile green iguana you need a high-output linear UVB — the Arcadia T5 HO 12% Forest is the standard recommendation for iguanas specifically. Replace it every 12 months regardless of whether it still produces visible light, because UVB output drops well before the bulb dies visually. What's your current enclosure setup — specifically the bulb-to-basking distance? That'll tell me if output strength is also a factor, or if it's purely the expired bulb.

I don't — and that's the point. A degraded bulb could be outputting almost nothing measurable regardless of what it was rated at new. Which means even replacing like-for-like, you'd be guessing at whether the new setup actually delivers adequate UVB at basking distance. The right purchase here is two things together: the Arcadia T5 HO 12% UVB bulb for the iguana's ongoing needs, and a Solarmeter 6.5 UVB meter so you can measure actual UVI at the basking spot and confirm the iguana is getting what they need — not what the packaging promises. The Solarmeter is the part most people skip and shouldn't. For a juvenile already recovering from MBD, knowing the number rather than assuming it is the difference between recovery and relapse. Aim for a UVI of 4–6 at basking level for a green iguana. The meter tells you when you're there, and when it's time to replace the next bulb.