SATCO Lighting S9551 1.6W, LED MR11 LED, 5000K, 40 degree beam spread, G4 Base, 12V AC/DC

Yes, if the socket is a bi-pin G4 and the fixture runs 12 volts. The S9551 is a G4 bi-pin MR11 rated for 12V AC or DC, so it drops into low-voltage halogen track heads, landscape-style indoor fixtures, and display lighting that used a 10W halogen MR11. It will not work in a line-voltage 120V socket.

The lamp itself takes 12V AC or DC and draws 0.133A at 1.6W. It runs on the existing low-voltage supply, so no separate LED driver is added. Keep in mind that a magnetic or electronic transformer sized for halogen has a minimum load, and a 1.6W lamp draws very little, so on a multi-lamp transformer you may need enough lamps on the circuit for it to hold output steady.

Yes. The S9551 is an enclosed rated lamp, so it can go in a sealed or gasketed housing without voiding its heat handling. It is also rated for damp locations and listed for indoor use, which covers covered porches, bathrooms, and cooler cases indoors, but not direct wet exposure.

Only if those are also 5000K. The S9551 is a fixed 5000K daylight lamp with 80 CRI, not a color-selectable one, so it reads crisp and blue-white next to a 2700K or 3000K halogen. If you are relamping part of a lobby or retail case, do the whole group at once or the mismatch is obvious.

The lamp is dimmable. Whether it dims smoothly depends on the transformer and dimmer it sits behind, since at 1.6W and 0.133A the load is far below what a halogen dimmer was designed to see. On a multi-lamp low-voltage circuit it generally behaves; on a single-lamp run expect to verify the dimmer's minimum load.

40 degrees is a flood-ish spread for an MR11, so it washes a shelf, a display case interior, or a small art panel evenly rather than punching a tight spot on one object. If you need a defined pool of light on a single item from a distance, you want a narrower beam MR11 instead. The lamp is lensed with a clear lens and a silver housing.

No. The S9551 is not DLC approved, so it will not qualify where a rebate program requires a DLC listing. It is FCC compliant and marked lawful for sale in California.

Burning position is universal, so the S9551 can be mounted base up, base down, or horizontal with no derating. That matters in cove and under-cabinet work where the socket orientation is whatever the fixture dictates.

Rated at 25,000 average hours. For an MRO or facilities schedule, a case light burning 12 hours a day works out to roughly 5.7 years per lamp, which is why LED MR11s are usually swapped in on a full-fixture basis rather than one at a time.

The base material is plastic with G4 bi-pin contacts. Older ceramic halogen sockets can be worn or heat-discolored from years of a 10W halogen running hot; the LED runs far cooler at 1.6W, so it does not add stress, but a socket with loose or corroded contacts will flicker with any lamp and should be replaced.