Feit Electric Infinity 3D Fireworks LED Light Bulb, ST19 LED Bulb, ST19/PRISM/LED,1 Count (Pack of 1), Multicolor

I swapped a standard bulb in a hallway pendant for the Prism bulb and the room changed character immediately. The fixture stopped being a light source and became an object to look at—almost a little stage set. Instead of a beam of white light, the bulb throws a constellation of multicolor streaks that appear suspended inside the glass. It’s a mood piece, and it announces itself the second you flip the switch. If you’re after ambiance or a bit of theater, it absolutely nails that brief.

First impressions and build

The Prism bulb uses a vintage ST19 silhouette—the teardrop profile you see in Edison-style lamps—but inside it’s a different story. The glass has a mirrored, slightly iridescent coating when off, so even unlit it reads as a decorative element. Turn it on and that coating comes alive, scattering light into fixed “firework” bursts that fill the interior. The effect is three-dimensional and consistent from all viewing angles; walk around the bulb and the display holds together like a hologram rather than a motion animation.

Fit and finish are solid. The bulb threads smoothly into a standard screw-in socket and sits securely. The coating is even, there are no visible seams or adhesive marks, and the overall presentation feels intentional rather than gimmicky.

Setup and compatibility

Installation is as simple as swapping any bulb: screw it in and you’re done. Two notes matter, though:

• It’s non-dimmable. Put it on a dimmer and you risk flicker, buzzing, or shortened lifespan.
• It’s designed for 120V, 60Hz circuits. If you’re outside North America, check voltage compatibility; this isn’t a universal bulb.

The bulb is rated for damp locations, which covers bathrooms and covered patios, though I wouldn’t put it where it can get wet. It comes to full brightness instantly, and in my testing there was no audible hum. UL/CUL certification and a mercury‑free design are reassuring from a safety and environmental standpoint, and Feit backs it with a two‑year warranty.

Light quality and the “wow” factor

This is the reason to buy the Prism bulb. The internal fireworks are multicolor—cool blues and purples blended with warmer pinks and amber—and the colored streaks appear to originate deep within the glass. The pattern is static (it doesn’t animate or sparkle), but because of the depth and the way the coating refracts, your eye reads motion as you move, which keeps it interesting. The effect is strongest in clear-glass fixtures or open shades; smoked or opaque shades mute it.

The spill on surrounding surfaces is subtle. You’ll notice a gentle color wash—a faint lavender or blue cast on nearby walls—but it’s understated. In a room with other lights, the Prism bulb still stands out visually; it doesn’t get washed out the way some decorative bulbs do.

Brightness and usability

At 2 watts, this is essentially an accent bulb. It’s closer to a night light than a task light. It won’t illuminate a room, it won’t replace your reading lamp, and it’s a poor choice for kitchens, offices, or anywhere you need functional brightness. Think of it as trading a socket for an art piece. If you plan around that, it’s excellent.

Where it shines (pun intended) is in layered lighting: use your normal fixtures for work and leave the Prism bulb on as a background glow or focal point. I had good results in a clear-glass pendant, a wall sconce with no shade, and a small table lamp with a very open shade. In all cases, the “fireworks” read clearly even with other lights on, and at night it was a cozy, low-impact presence.

Heat, efficiency, and longevity

Two watts is impressively efficient for something this visually dramatic. After hours of continuous use, the bulb was only mildly warm to the touch, which makes it comfortable to run for long stretches as an ambience set piece. It’s rated for up to 10,000 hours. I can’t validate that number yet, but after weeks of nightly use I haven’t seen any changes in color or intensity, and there’s been no flicker on a standard on/off switch.

Instant-on performance is exactly that—flip the switch and the full effect appears immediately. There’s no ramp-up or warm-up period.

Where the Prism bulb works best

• Clear-glass pendants, especially single-socket fixtures that are otherwise decorative dead space.
• Open table lamps on a sideboard or nightstand, where a soft, low-output glow is desirable.
• Wall sconces in hallways or entryways, where you benefit more from visual interest than brightness.
• Covered patios or balconies for occasional mood lighting (remember: damp, not wet).
• Themed spaces—holiday corners, game rooms, small retail displays—where a conversation piece draws the eye.

If you want more presence, use two or three fixtures in sightlines rather than expecting one bulb to carry a space. The combined effect reads festive without tipping into tacky, provided you keep the surrounding lighting cues simple.

Practical caveats

A few notes to keep expectations aligned:

• Don’t use it with a dimmer. This bulb is non-dimmable, and dimmers can cause poor behavior or failure.
• Avoid enclosed fixtures without ventilation. Heat isn’t extreme, but airflow is always a good idea for LED longevity.
• Expect decorative output only. If you need to navigate a dark stairwell or read a menu, you’ll need another light source.
• The mirrored glass looks great off, but it also means the bulb is a visual statement even when unlit. Pair it with fixtures that let it be seen.

Also, while the effect invites you to stare, the manufacturer cautions against looking directly into the light. In practice, it’s comfortable to view, but it’s still a point source—enjoy it the way you would a candle flame: nearby, not fixed on.

Value

This is a specialty bulb, and it’s priced like one. You’re paying for the finish and the effect, not lumens. The low power draw and 10,000‑hour rating offset some of that cost over time, and the two‑year warranty adds confidence, but you should buy it because you want the look. If you’re thinking “novelty that wears off,” I’d counter that the design is restrained enough to avoid the one‑note problem. It’s more a permanent ambiance layer than a seasonal gag.

If you need to light a full room, you’ll be disappointed. If you want a compact, reliable way to give a fixture personality, the Prism bulb earns its keep.

Recommendation

I recommend the Prism bulb as a decorative accent for anyone who understands it’s art first, light second. It’s efficient, runs cool, and creates a consistent, three‑dimensional firework effect that looks good both on and off. It installs like any standard bulb and feels well made, with safety certifications and a reasonable warranty to back it up. Just don’t expect brightness or dimming, and keep it to 120V, non-dimmer circuits. Used thoughtfully—in clear fixtures, layered with functional lighting—it’s a small change that meaningfully elevates a space.