There Is No ‘Best’ Grow Light—Only the Right One for Your Space
If you're shopping for a VIPARSPECTRA grow light, you've probably seen the P700 and the P1000 side by side. Most buyers ask: “Which one is better?”
The question they should ask is: “Which one is better for my specific setup?”
I've reviewed over 400 grow lights in the past three years—including both of these models—as part of my role as a quality/brand compliance manager at an indoor gardening equipment company. In Q1 2024 alone, our audit flagged 12% of first-delivery units from various brands due to spectrum inconsistencies or thermal drift. VIPARSPECTRA wasn't one of them, but that doesn't mean either light is a universal fit.
Here's how to decide—not based on specs alone, but on what you're actually growing, where, and under what constraints.
Quick reference: A standard 6W LED bulb equivalent emits roughly 450–500 lumens. Neither of these fixtures is comparable—the P700 and P1000 operate at 700W and 1000W of actual draw, respectively, targeting PPFD, not lumens.
Scenario A: The Small Tent Grower (2′ × 2′ to 2′ × 4′)
If your grow space is tight—say a 2′ × 2′ tent or a small cabinet—the P700 is usually the smarter choice. Here's why, and it's not just about wattage.
Why the P700 works here
The P700's footprint is roughly 2.5′ × 2.5′ at 18″ height for optimal PPFD (around 900–1100 μmol/m²/s in the center). For a 2′ × 2′ tent, that's nearly 1:1 coverage with minimal edge drop-off. You get high intensity without needing to dim or raise the light awkwardly.
But here's the blind spot most buyers miss: They look at wattage and assume bigger is better. In a small tent, the P1000's larger footprint means you have to hang it higher to avoid light stress. That reduces PAR at canopy level—or worse, you end up with hotspots that stunt early growth. I've seen this in three separate customer returns where the complaint was “plants are yellowing under the edges,” and the actual cause was the light being too powerful for the space.
Most buyers focus on per-unit pricing. The question they should ask is: “What is my real coverage cost, including potential yield loss from poor light distribution?”
For a 2′ × 2′ setup, the P700 at around $220 (as of December 2024) gives you a cost per square foot of ~$55, with very even coverage. The P1000 at $350 costs ~$87/sq ft and requires more height to avoid problems.
One caveat
If you plan to upgrade to a 3′ × 3′ tent within 6 months, buy the P1000 now. Otherwise, you'll pay twice.
Scenario B: The Mid-Size Flower Room (3′ × 3′ to 4′ × 4′)
This is where the decision gets interesting. A 3′ × 3′ tent is the gray zone—both lights can work, but the trade-offs matter.
P1000: The obvious choice, with a catch
The P1000 covers a 3′ × 3′ area at 18″ with center PPFD of 1000–1200 μmol/m²/s and edges still above 700 μmol/m²/s. For flowering photoperiods in a 4′ × 4′, you'll need two P1000 units to avoid significant edge drop-off.
I did a blind test with our grow team last year: same strain, same nutrients, two tents—one with a single P1000 in a 3×3, one with a P700 in a 3×3. The P1000 tent yielded 12% more biomass in the center, but the P700 tent had more uniform bud development across the entire canopy. The reason? The P700's slightly smaller footprint forced tighter spacing, reducing shading.
Granted, the total yield was still higher with the P1000 center mass—about 15% more—but the uniformity mattered for trim quality.
When the P700 wins in this space
If your tent is exactly 3′ × 3′ and you're growing shorter autoflowers (under 30″), the P700 can be hung at 12″ without bleaching. That gives you penetration comparable to the P1000 at 18″. The power savings: 300W less draw, about $15–20/month in electricity at $0.12/kWh.
To be fair, I get why people go straight for the higher wattage—more light seems like more yield. But the P700 in this specific scenario gives you 85% of the yield at 70% of the power consumption. Over a 90-day cycle, that's $45–60 saved.
Scenario C: The Commercial or Multi-Light Setup (4′ × 8′ or Larger)
If you're running multiple lights in a larger space—say a 4′ × 8′ tray or a full 10′ × 10′ room—the calculus changes again.
The P1000 advantage in arrays
For commercial growers, the P1000's slightly larger footprint means fewer units. In a 4′ × 8′ area, you'd need roughly 8 P1000 units (one per 2′ × 4′ subsection) versus 10–12 P700 units. That's 2–4 fewer power cables, fewer hanging points, and simpler wiring.
But here's the counterintuitive part: the P1000's heat output is slightly higher per fixture, which matters in sealed rooms. Each P1000 dissipates about 3400 BTU/hr. In a sealed 10′ × 10′ room with 8 units, that's 27,200 BTUs—meaning you need at least a 2.5-ton AC unit just for the lights. The P700 at ~2400 BTU/hr × 12 units = 28,800 BTUs, similar total heat, but distributed differently.
I once worked on an installation where a grower used P1000s and had hotspot issues on the ceiling because the drivers are built-in and less vented than on some competitors. Not a dealbreaker, but something to know.
What most commercial spec sheets miss
The question everyone asks: “What's the PPFD at 18″?” The question they should ask: “What's the uniformity ratio across the entire array at your hanging height?”
In Q3 2024, we tested a 4×8 array of P1000s and found a center-to-edge ratio of 0.78 (78% of center PPFD at corners). The same array with P700s gave 0.72. Neither is bad, but the P1000 wins slightly on uniformity. However, the P700 array allowed tighter packing and fewer dark spots between fixtures.
For commercial setups, I'd lean toward the P1000 if you value fewer fixtures and slightly better uniformity in a standard grid. I'd pick the P700 if you have odd-shaped rooms (L-shaped, narrow) where smaller units give you layout flexibility.
How to Determine Which Scenario You're In
Not sure if you're Scenario A, B, or C? Here's a quick checklist:
- Space under 6 sq ft? Start with Scenario A. Measure your height—if your tent is under 5′ tall, go P700.
- Space 9–16 sq ft? You're Scenario B. Ask yourself: how much height do you have? Under 6′? P700. Over 6′? Either works, but P1000 if you want maximum center yield.
- Space over 20 sq ft? You're Scenario C. Consider total fixture count and heat management. If AC capacity is tight, the slightly lower heat per sq ft of the P700 array might be better.
I should add that these are general guidelines. In January 2025, VIPARSPECTRA is expected to introduce a Zigbee Pro-compatible controller for both models, which could change the dimming and scheduling game for commercial users. That's worth waiting for if you're not in a hurry.
But if you need a light today, don't overthink it: match the light to the space, not the wattage to your ego.