Sunmaster Cool Deluxe Metal Halide Bulb – For Indoor Growing

A blue-rich metal halide built for vigorous vegetative growth

The Sunmaster Cool Deluxe Metal Halide is an MH conversion lamp for the vegetative stage, putting out a 7.2K, blue-rich spectrum that keeps young plants compact and well structured before the switch to flower. Sunmaster has built specialist HID lamps for growers for decades, and the Cool Deluxe range is tuned to support strong photosynthesis and sturdy framework-building through veg. It drops into a standard MH fitting of the matching wattage via its E40 mogul base, a simple swap for anyone running dedicated MH lighting.

Key Benefits

• 7.2K blue-rich spectrum tuned for the vegetative stage and tighter internodal spacing
• Sturdy, compact structure - plants build a strong frame ready for a heavy flowering canopy
• Reliable, consistent output from a brand with a long track record in horticultural lighting
• Standard E40 mogul base for a straightforward swap into a matching MH fitting
• Available in 150W, 400W and 1000W, so a propagation area and a full veg room can run the same lamp family

Stretchy, leggy growth under the wrong spectrum?

A red-heavy light source in veg pushes plants to stretch, leaving thin stems and wide internodes. The Cool Deluxe's blue-shifted output counters that, keeping vegetative growth tight and sturdy ahead of the move into flower.

How to Use

• Fit into a MH ballast and reflector of the matching wattage, handling the lamp by its base, not the glass
• Run through the vegetative stage; it can be carried into early flower, though most growers switch to a dedicated HPS or dual-spectrum lamp for the fuller red spectrum at bloom
• Hang at the distance recommended for your reflector, raising it as the canopy grows to manage heat
• Replace once output visibly drops, as MH lamps lose intensity and spectral balance with hours run