Product Overview
Philips F21T5/835/ALTO Fluorescent Lamp — 21W | 34-Inch T5 HE | 2,100 Lumens | 3500K | G5 Miniature Bi-Pin Base
The Philips F21T5/835/ALTO (Product Number 23082-1) is a 21W Silhouette Long Life T5 linear fluorescent lamp in the T5 miniature bipin, programmed-start format. The Philips catalog lists approximately 2,100 initial lumens (2,000 design lumens) at 3500K (TL 835) with a 85 CRI, and a rated average life of 25,000 hours at 3 hours per start and 35,000 hours at 12 hours per start.
Power 21W T5 HE Linear | Brightness 2,100 lm 2,000 design lm | Color Temp 3500K TL 835 | 85 CRI | Interface G5 Mini Bi-Pin Base | Rated Life 25,000 h 3 hr start (35,000 h at 12 hr) |
ADL Supply Expert Application & Replacement Guide
Facility teams and electrical contractors specify the F21T5/835/ALTO when re-lamping T5 HE fixtures where the 3500K appearance is already installed. It is a programmed-start lamp in the T5 miniature bipin format with a nominal length of 34 inches. 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: HE lamps must run on a ballast rated for that lamp type and wattage (21W). Do not substitute HO for HE lamps on the same ballast. When re-lamping part of a space, confirm the color temperature (3500K) so lamps in the same area match in appearance.
Detailed Product Specifications
- Brand: Philips Lighting
- Product Series: Silhouette Long Life T5
- Philips Product Number: 23082-1 (also written 230821)
- Ordering Code: F21T5/835/ALTO
- UPC Barcode Number (GTIN-12): 046677230821
- Catalog Description: TL 835, 3500K
- Lamp Wattage: 21W
- Lamp Type: T5 miniature bipin, programmed start, HE (High Efficiency class)
- Approximate Initial Lumens: 2,100 lm
- Design (Mean) Lumens: 2,000 lm
- Color Rendering Index (CRI): 85
- Color Temperature: 3500K
- Base: G5 Miniature Bi-Pin
- Nominal Length: 34 inches
- Rated Average Life: 25,000 hours (3 hours per start); 35,000 hours (12 hours per start)
- Manufacturer Package Quantity: 40 lamps per carton
- Manufacturer Warranty (per catalog): 36 months; certain limitations and conditions apply, see Philips for details
Ballast & Fixture Compatibility
This lamp is a programmed-start T5 HE lamp. Use an electronic T5 ballast rated for 21W HE 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 fixture or ballast label.
Equivalent Lamps & Cross-Reference
If you are comparing or replacing lamps, these equivalents are listed for reference. Confirm that the wattage, color temperature, and ballast type match your fixture before substituting, since ratings can differ between brands.
- GE Equivalent: F21W/T5/835/ECO (GE Part Number 46684)
- Sylvania (OSRAM) Equivalent: FP21/835/ECO (Part Number 20921)
Before You Order – Verify
- Confirm the fixture and ballast are rated for 21W T5 HE; T5 HE and T5 HO lamps are not interchangeable.
- The F21T5/835/ALTO is a G5 lamp with a nominal length of 34 inches; it will not fit T8 or T12 fixtures.
- Match the existing color temperature (3500K, TL 835) before partial re-lamping.
- Ratings follow the Philips SAG100 2008–2009 catalog; check the current Philips e-catalog for new project specifications.
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.
