PHILIPS HPI-T 400W Bulb

Buy HPI-T 400W Light Bulb. PHILIPS

This PHILIPS HPI-T 400W model offers consistent performance for thousands of hours, with quick start-up and compatibility with common horticultural equipment ( E40 socket, suitable ballast and quality reflector).

The cool spectrum typical of metal halides recreates bright spring days, favoring short internodes and robust plant mass before the transition to flowering.

The transparent bulb optimizes photon output and maintains stable color, creating an ideal environment for cloning, pre-growth, and extended vegetative phases in cannabis cultivation . For maximum effectiveness, it should be combined with proper ventilation, appropriately sized extraction, and a lamp-to-canopy distance adjusted to the leaf temperature.

The performance of the PHILIPS HPI-T 400W bulb is particularly interesting in 80–120cm grow tents, both as the main growth solution and in mixed rooms alongside LED grow lights that support spectrum and coverage.

Management is simple: the photoperiod is controlled (18/6 in vegetative) and, when the time comes, it is switched to a warm source for flowering or to a hybrid set to maximize production.

Indoor growing bulb HPI-T 400 W. PHILIPS

Designed for indoor growing , this lamp promotes root development, strong stems, and broad leaves, preparing the canopy for vigorous flowering. In SOG or SCROG setups, its cool light output helps maintain controlled height, improving the light-to-canopy ratio and optimizing space utilization.

What is the HPI-T 400W PHILIPS light bulb used for?

It serves as a growth light source for cannabis plants and other demanding crops. It provides a spectrum that promotes chlorophyll synthesis , structural vigor, and stress resistance. It is ideal for seedbeds, rooting, maintaining mother plants, and the vegetative stage prior to flowering with HPS or LED lighting.

Indoor growing tool HPI-T 400W bulb. PHILIPS

• Technology : Metal halides HPI-T (tubular clear bulb).
• Power : 400 W | Socket : E40.
• Application : growth , cuttings, mother plant maintenance.
• Power-on : fast, stable operation on 400W equipment.
• Mounting : multi-position operation; perfect with open or cooled reflectors.
• Integration : efficient combination with LED grow lights or HPS flowering lights.
• Good practices : avoid touching the glass, clean the reflector, record the installation date for the maintenance plan.

How do I use the PHILIPS HPI-T 400W bulb?

1. Disconnect the power to the equipment and allow it to cool before any handling.
2. Screw the HPI-T 400W PHILIPS bulb into an E40 socket, holding it by the base, without touching the bulb.
3. Connect to the 400W ballast and check grounding and protections.
4. Adjust photoperiod to 18/6 for vegetative growth; maintain extraction and ventilation to stabilize temperature and VPD.
5. Start 40–60 cm from the canopy and gradually approach, monitoring leaf temperature and crop response.
6. Plan to switch to a warm flowering source (HPS or red spectrum LED) when the structure is ready.

Price of HPI-T 400W bulb. PHILIPS

A high-value option for boosting vegetative growth in medium-sized spaces. It allows for the configuration of economical and efficient kits for initial stages, with a lower investment compared to more complex alternatives.

Where can I buy a PHILIPS HPI-T 400W light bulb online?

Available at Hydroponics Blanes , a trusted Grow Shop and Grow Shop in Spain with discreet 24/48h shipping . Extensive lighting catalog: metal halide, HPS and LED grow lights , plus ballasts, reflectors and consumables to complete every setup.

For those seeking a compact and intense green vegetative growth, the PHILIPS HPI-T 400W bulb offers a cool spectrum, fast start-up, and immediate compatibility with standard equipment.

A practical choice for indoor growing that prepares the ground for a flowering full of potential, whether with warm HPS or LED grow lights in hybrid approaches.

At Hydroponics Blanes you can expect expert advice, complete packages and discreet shipping that simplifies every step of the cannabis cultivation and plant care project.