What bulb would work for a low-key plant shelf?

A full-spectrum white LED grow bulb is a good place to start. A color temperature around 5000 to 6500K gives a daylight-like appearance, but that number alone won’t tell you how much useful light reaches the plants. Check the bulb’s output and coverage too.

One bulb may cover a small area, but it can leave plants on other shelves or farther from the lamp with much less light. Think about the whole shelf layout, not just the bulb type.

I’d keep it simple: use a grow bulb in a regular lamp, aimed at the plants, and let the south-facing window contribute what it can. That gives you a less conspicuous setup than adding several fixtures right away.

Try one bulb if the plants are clustered together, then see whether it reaches all of them. If some are shaded or sit well off to the side, adding another light may make more sense than choosing a stronger bulb for the whole shelf.

Don’t get too hung up on a single perfect schedule. A timer makes the light routine consistent, and around 10 to 12 hours is a reasonable starting point for supplemental lighting. If the plants are getting little natural light, some setups use longer days, but watch how the plants respond rather than assuming every shelf needs the same setting.

Keep the bulb close enough to reach the leaves, while leaving room to adjust if the light seems too intense. The distance and coverage matter as much as the bulb’s label.