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what kind of space are you working with - a bedroom, living room, something with natural light nearby?
the 10.0 UVB angle most folks mention is solid, and yeah a timer keeps things consistent. but what really matters is placement. i've found that mounting the light directly above or to the side of the cage (about 12 inches away) makes way more difference than just having the bulb there. finches are active little things and they'll actually bask under it if it's positioned right, which is when they actually absorb the UV. if it's tucked behind furniture or too far away, they miss out even with the light on.
one thing that gets overlooked - reflectors. a simple aluminum reflector or even positioning the fixture so the light bounces off a light-colored wall back into the cage bumps up the effective UV exposure without needing to blast them with more intensity. also check your bulb's age; those tubes lose potency after about a year even if they still look fine, so if you've had one running for over 12 months it's probably time to swap it out. the 10-12 hour cycle is standard for good reason, matching natural day length, so stick with that on a timer if possible.
Mark_75 asker
Bedroom with a corner setup, natural light from one window. Already using 10.0 UVB on a timer, but hadn't considered the reflector angle - that's helpful.
Finches need UVB lighting to metabolize calcium and stay healthy, so a full-spectrum bulb (UVB 10.0 works well) on a timer for about 10-12 hours daily is pretty standard. Are you using a regular cage setup or something more elaborate, and do your birds have access to natural sunlight at all currently? That'll help me suggest whether you need a dedicated fixture or if something simpler would work for your space. Fluorescent or LED UVB bulbs both work, though LEDs tend to last longer if you don't mind spending a bit more upfront.
The 10.0 UVB recommendation is good, but placement matters way more than most people realize - mounting the light too high or behind glass kills most of the benefit since UVB doesn't penetrate well through standard materials. Position it close enough that your finches actually get exposed (usually 8-12 inches depending on the fixture), and skip the glass barriers if you can. A timer for 10-12 hours daily keeps their circadian rhythm steady, which is honestly the bigger win than chasing the "perfect" UVB percentage. If natural sunlight reaches your setup regularly, you might actually need less artificial UVB, though direct sun through a window doesn't help since glass blocks the wavelengths that matter.
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