Sylvania Grolux 600W Dual Spectrum HPS Bulb – For Grow Tents

One Bulb for Veg and Flower

The 600W Sylvania Grolux Dual Spectrum is a high-pressure sodium lamp that blends red and blue wavelengths in a single bulb, delivering around 90,000 lumens from a 600W E40 cap. It gives growers who would rather not swap bulbs between stages a balanced spectrum that supports vegetative structure and then carries plants through flowering from the same fitting.

It comes in two versions: the standard 230V lamp for ordinary 600W ballasts, and a 400V lamp for 400V-rated ballasts and professional fittings. The two are not interchangeable, so choose the version that matches the lamp voltage on your ballast.

Need one lamp that covers the whole grow cycle?

Switching bulbs between veg and flower adds cost and hassle, and a mismatched spectrum at either stage leaves plants stretching or finishing with underdeveloped flowers. The Grolux's dual-spectrum output supports healthy vegetative growth and then drives flower development to harvest without a bulb change.

Key Benefits

• Dual red and blue spectrum suited to both veg and flower from one lamp
• 90,000 lumens of output for strong photosynthetic drive on a 600W ballast
• Reliable, consistent output for repeatable results run after run
• Standard E40 cap - drops into any 600W SON-T fitting of the matching voltage
• One lamp, whole cycle - no bulb swap between stages

How to Use

• Fit into a 600W HID fitting via the E40 cap: the 230V lamp on a standard 230V ballast, the 400V lamp only on a 400V ballast
• Run 18/6 for vegetative growth, then switch the timer to 12/12 to initiate flowering
• Hang at a reflector-appropriate distance, raising the light as plants grow to avoid heat stress
• Replace after a full grow cycle or two as HPS output tails off with age