Can I use the flashlight on my phone to test lighting before buying lights?

Yes, and you should. Most phone flashlights are around 5000K (cool), which is the worst case for amber, but it lets you test position. If your piece looks acceptable with phone-light positioning, it'll look great with a proper 2700K bulb in the same spot.

Do LED lights damage amber or resin over time?

Quality LEDs at indoor display intensities don't emit meaningful UV, they're safe. Avoid: sunlight (direct, all-day exposure can yellow some resins over years) and fluorescent tubes (some emit UV-A). LED puck lights are the safest choice.

Should I put a glass case over an amber display?

Only if dust is a real problem (high-foot-traffic room, pets, near a kitchen). Glass cases dim the piece and reflect light. For most home displays, an open shelf with a quick weekly dusting looks better.

What's the difference between 'warm white' bulbs from different brands?

'Warm white' isn't standardized, it could mean 2700K or 3000K depending on the brand. Always look at the Kelvin number on the box, not the marketing word. 2700K = candlelight warm. 3000K = soft white.

How do I light a Jurassic Park-style mosquito-in-amber piece for max wow factor?

Backlight at 2700K with a narrow 25° beam, set the piece on dark wood, and position so a light beam passes directly through the mosquito inclusion. The bug becomes the focal point, exactly like the screen-accurate cane prop. VEOJEIN's mosquito-in-amber pieces are designed for this kind of backlight setup.

Display Lighting for Resin & Amber Pieces: A Practical Guide