FAQ: Your HPS Grow Light Questions Answered
We've compiled the most common questions about HPS grow lights based on our community discussions and grower experiences. If you don't see your question answered here, feel free to contact us or join our community forum.
Do people still use HPS lights?
Yes, many growers still use and prefer HPS lights despite the rise of LED technology. HPS lights remain popular for their proven track record, superior canopy penetration, and the specific light spectrum they provide which some growers find produces better flowering results. They're also still widely used in commercial operations and by growers who appreciate their lower upfront cost compared to high-quality LEDs.
Will a 600W HPS be too hot for my 4x4 tent?
A 600W HPS can work in a 4x4 tent, but proper heat management is crucial. You'll need adequate ventilation with a good exhaust fan (minimum 400+ CFM), possibly an air-cooled hood, and strategic timing (running lights at night when ambient temperatures are lower). Without these measures, a 600W HPS can potentially raise temperatures to harmful levels in a space that size. Some growers successfully use 600W HPS in 4x4 tents, while others find it challenging to manage the heat.
How long does it take to recoup LED costs vs. HPS?
Based on current electricity prices and equipment costs, most growers report recouping the higher initial investment of quality LEDs within 4-5 years through electricity savings. This calculation depends on your specific usage patterns, local electricity costs, and the price difference between the HPS and LED systems you're comparing. In areas with high electricity costs like the UK, the payback period can be shorter. Our cost calculator can help you determine the specific payback period for your situation.
Can I use my old HPS ballast with a new LED-style bar light?
No, HPS ballasts and LED drivers are fundamentally different technologies and are not interchangeable. HPS ballasts are designed to provide the high voltage needed to ignite the arc in HPS bulbs and then regulate current flow, while LED fixtures require specific DC power supplies (drivers) designed for their voltage and current requirements. If you're upgrading to LED, you'll need to purchase complete LED fixtures with their appropriate drivers.
How often do I need to replace my HPS bulb?
For optimal performance, most growers replace their HPS bulbs every 12-18 months of use. While the bulbs may continue to function beyond this period, their spectrum shifts and light output diminishes over time, affecting your plants' growth and yield. This replacement cost is an important factor to consider when comparing the long-term economics of HPS vs. LED lighting systems.
Are HPS lights good for growing vegetables like tomatoes and peppers?
Yes, HPS lights work well for fruiting vegetables like tomatoes and peppers. These plants benefit from the red-dominant spectrum of HPS lights, which promotes flowering and fruit development. The high light intensity of HPS also helps these crops develop properly. However, you may want to supplement with some blue light (such as metal halide) during vegetative growth stages for optimal results.
Still Have Questions?
Our community is here to help! Join our forum discussions or check out these related resources:
- HPS vs. LED: An Honest Comparison
- Heat Management Guide for HPS Growers
- Beginner's Guide to HPS Lighting