Hortilux Eye PowerVEG T5 4ft 420 nm 54W HO *pickup in -store only

The Eye Hortilux PowerVEG T5 4ft 420nm 54W HO is a spectrum-specific fluorescent grow lamp designed for indoor cultivation. It delivers blue-violet light at 420 nanometers and functions as a component within the PowerVEG T5 system — a multi-lamp approach where growers combine different spectrum lamps to build targeted light formulas for vegetative growth, flowering, or full-cycle cultivation.

Eye Hortilux PowerVEG T5 420nm Specifications

Specifications below are derived from the product title and manufacturer description text. The 420nm lamp is one of five lamps in the PowerVEG T5 lineup; each lamp in the system carries a distinct spectrum role.

Specification	Value
Brand	Eye Hortilux
Lamp Type	T5 HO (High Output Fluorescent)
Length	4 ft (48 in)
Wattage	54W
Peak Wavelength	420 nm
Spectrum Color	Blue-violet
System Role	Blue accent lamp (pairs with FS+UV base)
Case Quantity	24 lamps per case
Availability	In-store pickup only
Product Family	PowerVEG T5

Why Choose the Eye Hortilux PowerVEG T5 420nm

The PowerVEG T5 system is built around a modular concept: rather than offering a single broad-spectrum lamp, Eye Hortilux designed a family of five lamps that growers mix and match to construct specific spectral formulas. The 420nm lamp is one of two blue-spectrum lamps in the system (the other being the 460nm), and it plays a defined role in vegetative and start-to-finish formulas.

• Designed for system use, not standalone operation. The 420nm lamp is intended to supplement the PowerVEG FS+UV (Full Spectrum + Ultra Violet) base lamp. The FS+UV provides the broadband spectral foundation; the 420nm adds targeted blue-violet output on top of that foundation.
• Part of a grower-configurable lighting approach. The PowerVEG T5 lineup lets growers adjust their light spectrum by changing which lamps occupy which slots in a multi-lamp T5 fixture. This allows a single fixture to serve vegetative and flowering stages by swapping lamp combinations.
• 420nm wavelength targets early plant growth stages. According to the manufacturer description, combining both blue PowerVEG lamps (420nm and 460nm) with the FS+UV base lamp produces a spectrum aimed at early stages of plant growth — the formula Eye Hortilux refers to as the Veg Formula.
• Standard T5 HO form factor. At 4ft and 54W, this lamp fits the same fixtures as any standard T5 HO replacement lamp. If you already have a 4ft T5 fixture, this lamp slots in without any hardware changes.
• Sold individually with bulk case availability. Priced per lamp with a case quantity of 24, making it practical for growers running multi-lamp fixtures or managing inventory across multiple grow rooms.

Best Uses for the Eye Hortilux PowerVEG T5 420nm

This lamp fits specific roles within a PowerVEG T5 setup. Its usefulness depends largely on what other lamps it is combined with in the fixture.

• Vegetative growth formula. Combine the 420nm with the PowerVEG 460nm and one or more FS+UV lamps in a multi-lamp fixture. Eye Hortilux describes this pairing as the Veg Formula — a spectrum weighted toward the blue range to support early-stage plant development.
• Start-to-Finish formula. The manufacturer description lists a Start-to-Finish Formula that also includes the 420nm lamp, making it appropriate for growers who use a single lamp formula across the entire grow cycle.
• Propagation and seedling rooms. T5 HO fixtures running blue-weighted spectra are commonly used in propagation areas. The 420nm lamp contributes to a blue-dominant canopy light environment suited for cuttings and seedlings under T5 lighting.
• Supplemental spectrum in mixed-source rooms. In grow rooms where HID or LED fixtures provide primary light, T5 HO lamps can provide targeted side or under-canopy light. The 420nm can fill a blue-spectrum gap in rooms where the primary fixture is warm-biased.
• Commercial propagation operations. With case quantities of 24 per case, this lamp is practical for commercial propagation facilities that need consistent lamp replacement cycles across many fixtures at once. The T5 Designer 4ft 4-tube fixture is a compatible option for running this lamp in a complete T5 setup.

PowerVEG T5 420nm vs Standard T5 HO Grow Lamps

Most T5 HO grow lamps are sold as single broad-spectrum bulbs — a 6500K blue lamp for veg or a 3000K warm lamp for flower. The PowerVEG T5 system takes a different approach: each lamp occupies a narrow spectral role, and growers build a formula by combining multiple lamps in a multi-lamp fixture.

A standard T5 HO grow lamp (such as a 6500K blue lamp) can occupy any slot in a T5 fixture and serve as a general-purpose veg light on its own. The PowerVEG 420nm lamp, by contrast, is not intended to run alone — it requires pairing with at least the PowerVEG FS+UV base lamp to function as designed. If you only have one or two lamp slots in a fixture, a standard broad-spectrum T5 HO lamp would be more practical than a single PowerVEG accent lamp.

Where the PowerVEG system offers an advantage is in multi-lamp fixtures (typically 4-lamp or 8-lamp T5 units) where different spectrum lamps can coexist. In that context, the 420nm lamp adds a discrete blue-violet band that a broad-spectrum lamp does not deliver at the same intensity. Growers building a dedicated veg room or a propagation rack with a 4-lamp T5 fixture will find more value in the PowerVEG approach than those running single-lamp setups.

For growers evaluating larger lighting investments, the Gavita Pro 1700e LED is a high-output LED fixture that delivers a full broad spectrum in a single unit — a different category of product but a common consideration when planning grow room lighting.

Compatibility

The Eye Hortilux PowerVEG T5 420nm lamp is a 4ft T5 HO lamp and is compatible with any standard 4ft T5 HO fixture. T5 HO lamps use a G5 bi-pin base and require a T5 HO ballast; they are not compatible with T8 or T12 fixtures.

Within the PowerVEG system, this lamp is designed to be used alongside other PowerVEG T5 lamps. The five lamps in the system are:

• FS+UV — Full Spectrum + Ultra Violet (the base lamp required in all formulas)
• 420nm — Blue-violet (this lamp)
• 460nm — Blue
• 633nm — Red
• 660nm — Deep red

The manufacturer describes three formula configurations:

• Veg Formula: FS+UV + 420nm + 460nm
• Flower Formula: FS+UV + 633nm + 660nm
• Start-to-Finish Formula: combines all five lamps (or selected combination across all growth stages)

For best results, run the 420nm alongside the FS+UV base lamp in a multi-lamp fixture. Using the 420nm without the FS+UV base lamp is outside the manufacturer’s described usage and will not deliver the intended spectral formula.

Usage Guidelines

The PowerVEG T5 system is designed to be used in multi-lamp T5 fixtures. The specific lamp combination you run determines the spectral formula delivered to your plants. Below are the grower-facing guidelines derived from the manufacturer description.

Veg Formula (early growth stages): Pair the 420nm with the PowerVEG 460nm lamp and the FS+UV base lamp. This combination targets early-stage plant development with a blue-weighted spectrum. The FS+UV provides the broadband foundation; the two blue lamps (420nm and 460nm) add blue-violet and blue output on top.

Start-to-Finish Formula: The manufacturer lists a Start-to-Finish Formula that includes this lamp. This approach is suited to growers who prefer not to change lamp configurations between growth stages. For the Flower Formula, substitute the 633nm and 660nm red lamps for the 420nm and 460nm blue lamps while keeping the FS+UV base lamp in all configurations.

Fixture slot planning: In a 4-lamp T5 fixture running the Veg Formula, a typical split would be two FS+UV lamps with one 420nm and one 460nm. In an 8-lamp fixture, more variation is possible. The manufacturer documentation provides recommended lamp counts by fixture size; refer to the PowerVEG formula guide included with the FS+UV lamp or available through authorized distributors.

Lamp replacement: T5 HO lamps lose output intensity over time. Replace lamps on a schedule consistent with your production cycle. Mixing new and aged lamps in the same fixture will affect the balance of the spectral formula.

How to Set Up the PowerVEG T5 420nm

Installing the PowerVEG 420nm lamp follows the same process as any T5 HO lamp replacement. These steps apply to standard 4ft T5 HO fixtures.

1. Power off the fixture completely. Switch off the fixture and unplug it from the outlet or disconnect from the timer before handling lamps. Do not attempt to change lamps while the fixture is energized.
2. Identify the correct lamp slots. In a multi-lamp fixture, decide which slots will carry the FS+UV base lamps and which will carry the 420nm accent lamps, based on the formula you are running (Veg, Flower, or Start-to-Finish).
3. Remove the existing lamp (if replacing). Rotate the T5 HO lamp approximately 90 degrees to unlock the bi-pin base from the end caps, then pull straight out. Handle used lamps carefully — fluorescent lamps contain mercury and should be disposed of according to local regulations.
4. Insert the PowerVEG 420nm lamp. Align the G5 bi-pin base with the end cap slots, insert the pins, and rotate approximately 90 degrees to lock in place. Confirm the lamp is seated firmly at both ends.
5. Repeat for all lamp positions in the fixture. Complete the intended formula layout (for example, two FS+UV and one 420nm and one 460nm in a 4-lamp fixture for the Veg Formula).
6. Restore power and verify operation. Plug in and power on the fixture. T5 HO lamps should strike immediately. If a lamp flickers or does not strike, check that the bi-pin connections are fully seated and that the lamp is undamaged.
7. Set fixture height for growth stage. Position the T5 fixture at the appropriate height for your plant canopy. T5 HO fixtures are typically run closer to the canopy than HID or high-output LED fixtures. Consult the fixture manufacturer’s coverage recommendations for the specific unit you are using. A complete propagation setup may also benefit from a heated propagation kit like the Super Sprouter Premium Heated Propagation Kit with T5 Light.

Sources & Further Reading