NUVO Lighting TH643 12W LED Cinch Track Head, 3000K, Matte Black and Brushed Brass Finish

Yes, the TH643 is an H-style track head. NUVO's own installation sheet for it is titled TH643 H-Style Track Head Installation Instructions, so the adapter is cut for H-style (3-wire, single-circuit) track. It will not seat in J-style or L-style track, and it will not work in a two-circuit or proprietary rail system. If the existing track in the space is J or L, you need a head cut for that system instead.

No. The Cinch TH643 carries a Dry location rating only, so it is limited to interior spaces that stay dry: retail, offices, lobbies, galleries, residential interiors. A covered exterior soffit, a parking structure, or a shower area needs a damp or wet rated fixture instead. Safety listing is cETLus, which covers both US and Canadian installations.

That is the normal use case for the TH643. It is a single 120V track head that twists into an existing H-style track run, so you can swap one fixture and leave the rest of the row alone. Keep in mind the lamp is an integrated LED rather than a replaceable bulb, so when the diode reaches end of life the head itself gets replaced, not a lamp. Rated life is 30,000 hours.

The TH643 is dimmable on 120V line voltage. As with any integrated LED, it needs an LED-rated (ELV or forward-phase LED) dimmer rather than an old incandescent-only rheostat, and total connected load on the circuit decides how many heads one dimmer can carry.

Extension is 5.25 inches, with an overall width of 3.88 inches and height of 3.25 inches. That 5.25 inch projection is what you add to the height of the track itself when figuring clearance under a low soffit or over tall shelving. At 0.57 lbs the head is light enough that it does not add meaningful load to an existing track run.

The Cinch TH643 is built with an aluminum and steel body, finished in matte black with brushed brass accents. Aluminum doubles as the heat sink for the integrated LED, which is what gets the fixture to its 30,000 hour rated life. It is a contemporary styling package, not a utility head, so it suits front-of-house retail and hospitality where the fixture is visible.

For anything where color accuracy sells the product, yes. The TH643 is a 90 CRI source at 3000K, which renders fabric, skin tone, food, and paint far closer to true than the 80 CRI heads typically specified for general office and corridor use. Gallery, apparel, cosmetics, and food display are the cases where the difference is visible to a customer.

Two things to record for a submittal package: the TH643 carries a California Prop 65 disclosure for lead, and it is RoHS compliant. It is also cETLus safety listed for US and Canada. Manufacturer spec sheet and installation instructions are published by Satco for the TH643 if your file requires the originals.

The TH643 is a single-finish part number: matte black with brushed brass accents. If a job needs an all-black or all-nickel head to match other trim in the space, that is a different model number rather than an option on this one.