Product Overview
Philips F48T8/TL835/HO/ALTO 44W — 44W | 48 in T8 HO | 4,000 Lumens | 3500K Natural White | R17d Recessed Double Contact Base
The Philips F48T8/TL835/HO/ALTO 44W is a 44W T8 High Output (HO) fluorescent lamp with Philips ALTO low-mercury technology and an R17d recessed double-contact base. It produces 4,000 initial lumens (3,600 mean lumens) at 3500K Natural White with a CRI of 86 and a rated average life of 18,000 hours.
Power 44W T8 High Output | Brightness 4,000 lm Initial lumens | Color Temp 3500K Natural White | CRI 86 | Interface R17d Recessed Double Contact | Rated Life 18,000 h Average rated |
ADL Supply Expert Application & Replacement Guide
This is a High Output T8, not a standard T8. It produces more light than a standard 32W T8 from the same 48 in of tube, which can reduce the number of lamps needed to reach a target light level in high-output commercial and industrial fixtures.
Philips ALTO technology applies its lowest-level mercury design at the manufacturing stage, and the trichromatic phosphors are listed for improved lumen maintenance. The previous listing also cites an efficacy of over 95 lumens per watt and a longer life than standard fluorescent lamps.
The R17d recessed double-contact base is different from the G13 bi-pin base on regular T8 lamps, so the two types do not interchange without changing the lampholders.
Detailed Product Specifications
- Brand: Philips Lighting
- Product Name: Philips F48T8/TL835/HO/ALTO 44W
- Lamp Type: T8 High Output linear fluorescent (ALTO)
- Lamp Wattage: 44W
- Color Temperature: 3500K, Natural White
- Color Rendering Index (CRI): 86
- Initial Lumens: 4,000 lm
- Mean Lumens: 3,600 lm
- Rated Average Life: 18,000 hours
- Base: R17d Recessed Double Contact (black)
- Nominal Length (MOL): 48 in
- Bulb Diameter: 1 inch (T8)
- Lamp Code: F48T8/TL835/HO/ALTO
- Product Series: Philips Alto
- Lamp Efficacy: >95 lumens per watt
- Phosphor Technology: Trichromatic
- Mercury Technology: Philips Alto low-mercury
Ballast & Fixture Compatibility
A lamp of this type needs a ballast rated for T8 High Output operation. A standard 32W T8 ballast will not drive it correctly. Confirm the ballast and fixture are rated for 44W T8HO lamps before ordering.
Before You Order – Verify
- Confirm the fixture uses R17d recessed double-contact lampholders (not G13 bi-pin).
- Confirm the ballast is rated for 44W T8 High Output lamps.
- Confirm the fixture accepts a 48 in lamp.
- Confirm 3500K matches the lamps already installed before partial re-lamping.
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.
