Product Overview
Philips F24T5/850/HO/ALTO Fluorescent Lamp — 24W | 22-Inch T5 HO | 5000K (850) | G5 Miniature Bi-Pin Base
The Philips F24T5/850/HO/ALTO (Product Number 41277-5) is a 24W T5 High Output (HO) linear fluorescent lamp in the T5 miniature bipin format, with a 5000K color temperature (TL 850 designation), a G5 base and a nominal length of 22 inches, matching the other Silhouette Long Life T5 HO 24W lamps in the Philips catalog.
Power 24W T5 High Output | Color Temp 5000K TL 850 | Interface G5 Mini Bi-Pin Base | Length 22 in Nominal | Output Class T5 HO High Output |
ADL Supply Expert Application & Replacement Guide
Facility teams and electrical contractors specify the F24T5/850/HO/ALTO when re-lamping 24W T5 HO fixtures where the 5000K appearance is already installed. The G5 base is specific to T5 lamps, so this lamp does not fit T8 or T12 lampholders.
Match the lamp to the fixture's ballast: HO lamps must run on a ballast rated for T5 HO 24W lamps. Do not substitute HE lamps on an HO ballast. When re-lamping part of a space, confirm the color temperature (5000K) so lamps in the same area match in appearance.
Detailed Product Specifications
- Brand: Philips Lighting
- Product Series: Silhouette Long Life T5 High Output (HO), ALTO
- Philips Product Number: 41277-5 (also written 412775)
- Ordering Code: F24T5/850/HO/ALTO
- UPC Barcode Number (GTIN-12): 046677412777
- Lamp Wattage: 24W
- Lamp Type: T5 miniature bipin, HO (High Output class)
- Color Temperature: 5000K (TL 850)
- Base: G5 Miniature Bi-Pin
- Bulb Diameter: 16 mm (T5)
- Nominal Length: 22 inches (same as the F24T5/HO/ALTO family in the Philips catalog)
- Initial Lumens, CRI, Rated Life: Not published for this code in the Philips catalog on file; see Before You Order
Ballast & Fixture Compatibility
Use an electronic T5 ballast rated for 24W T5 High Output lamps and confirm the rating on the ballast label or fixture nameplate before installing. ADL Supply can help match a ballast to your fixture if you send us the label.
Before You Order – Verify
- Confirm the fixture and ballast are rated for a 24W T5 HO lamp; T5 HE and T5 HO lamps are not interchangeable.
- The F24T5/HO/ALTO is a G5 lamp with a 22-inch nominal length; it will not fit T8 or T12 fixtures.
- Match the existing color temperature (5000K, TL 850) before partial re-lamping.
- The Philips SAG100 2008–2009 catalog lists the 24W HO lamp only in 830, 835 and 841. Initial lumens, CRI and rated life for this 850 lamp are not published there, so they are not shown; confirm them on the current Philips datasheet if your specification requires them.
Bulk Commercial Lighting Supply & Project Support
ADL Supply delivers commercial-volume fulfillment, tiered contractor pricing, and full pallet project quoting to electrical accounts across the United States.
For wholesale inquiries, volume pricing, or manufacturer spec sheet documentation, call our commercial branch at 1-800-235-3489.
