Good outdoor lighting is useful, targeted, low, controlled, and warm. Get these five right and your yard is safer, your bill is lower, and Kirkwood’s night sky comes back. From DarkSky International & the Illuminating Engineering Society.
Every light should have a clear purpose. If it’s lighting the whole yard, the trees, or the sky, it’s not doing a job — it’s just glare and waste. Start by asking of each fixture: what is this actually for?
Use full-cutoff fixtures that point light at the ground. You should not be able to see the bulb from the side or from a neighbor’s window. (Kirkwood’s code already requires full-cutoff fixtures on new outdoor lighting — §25-52.)
Brighter is not safer; glare actually hurts your ability to see. Use the lowest useful brightness. Your eyes adapt to far less light than you’d guess — a single shielded, dim fixture beats a floodlight.
Timers, motion sensors, and dimmers beat dusk-to-dawn lighting. A motion light that’s off most of the night is more noticeable when it does come on — and a light that’s off is the darkest and cheapest of all.
Use warm-colored light: 3000K or lower, and 2200K or warmer near parks, streams, and wildlife. Warm light scatters less, so it means less skyglow, less glare, and less harm to sleep and wildlife.