SATCO Lighting S49738 45W LED HID Replacement, 80 CRI, 4000K, Type B, Ballast Bypass, Medium Base, Economy Hi-Pro

It wires direct. The S49738 is a Type B ballast bypass lamp, so the existing HID ballast has to be removed or bypassed and line voltage run straight to the socket. If you drop it into a fixture with the ballast still in circuit, it will not operate correctly. Plan on an electrician opening the fixture as part of the retrofit rather than a straight lamp swap.

4000K is a neutral white, a clean commercial white between warm 3000K and cool daylight 5000K. It will match other 4000K lamps on the same floor; it will read noticeably cooler next to 3000K and warmer next to 5000K. Color rendering is 80 CRI, which is the normal spec for warehouse, parking, and general commercial areas where color accuracy is not critical.

It is the right approach when the fixture housing and reflector are still in good shape and you only want to change the lamp and remove the ballast. The S49738 is a 45 watt LED built as an HID replacement, so it draws a fraction of what the original metal halide lamp did, and being ballast bypass there is no ballast left to fail later. If the fixture itself is corroded or the optics are shot, a full LED high bay fixture is the better spend, since a lamp swap will not fix a bad reflector.

Treat it as a non-dimming lamp on a standard line voltage circuit. Nothing in the S49738 spec calls out dimming, and ballast bypass HID replacements are generally switched on and off rather than dimmed. For controls, switch the whole circuit with a relay or line voltage sensor instead of putting a dimmer in front of it.

Satco Lighting S49738. That number covers the 45 watt LED HID replacement in 4000K, 80 CRI, Type B ballast bypass, medium base, Economy Hi-Pro, with a white finish. Satco's Hi-Pro line runs several wattages and color temperatures, so ordering by the S number rather than by wattage alone keeps you from getting a 3000K or 5000K lamp by mistake.