We sell both brands. We hear every question. Here's the honest side-by-side comparison from people who actually use these lights.
HLG and AC Infinity are the two most-asked-about grow light brands in our store. Not even close. Every week someone walks in, phone in hand, and asks us which one they should buy. We've been selling both for years. We've seen the harvests, heard the complaints, and dealt with the warranty claims from each side.
This page isn't a spec sheet. You can find that on the manufacturer websites. This is what we actually think after selling hundreds of units of each brand, talking to the growers who use them, and watching the results come in. Both are good. Neither is perfect. Here's how to pick the right one for your grow.
Choose HLG if you want maximum raw efficiency, proven yields, and you don't care about app control. HLG has the track record, the 5-year warranty, and a community of growers who swear by them. The Diablo series is the gold standard for home growers who just want the best light they can hang.
Choose AC Infinity if you want smart automation, ecosystem integration, and a modern bar-style design. If you already run AC Infinity fans and controllers, adding their lights means one app controls your entire grow room. Their Samsung LM301H EVO diodes are cutting-edge, and the detachable driver design runs cooler in tight tents.
The model you need depends on your tent. Here's the direct matchup at every common size.
| Tent Size | HLG Pick | HLG Price | AC Infinity Pick | ACI Price | Our Take |
|---|---|---|---|---|---|
| 2x2 | HLG 100 Rspec | $149 | IONBOARD S22 | $119 | ACI saves you $30. Both work great for seedlings and clones. |
| 2x4 | HLG 200 Rspec | $279 | IONBOARD S24 | $239 | Close call. HLG has the efficiency edge, ACI has the price edge. |
| 3x3 | HLG 225 Diablo X | $299 | IONBOARD S33 | $259 | HLG Diablo X is the better light here. Worth the $40 premium. |
| 4x4 | HLG 350 Diablo | $549 | IONFRAME EVO6 | $500 | The big matchup. Diablo for raw output, EVO6 for smart control. |
| 4x4 (budget) | — | — | IONBOARD S44 | $379 | No HLG equivalent at this price. ACI owns the budget 4x4 slot. |
| 5x5 | HLG 750 Diablo | $999 | IONFRAME EVO8 | $799 | $200 gap. HLG yields more. ACI saves money and adds app control. |
| 5x5 (value) | HLG 750 Diablo ES | $699 | IONFRAME EVO8 | $799 | HLG ES flips the price game. Same 5x5 coverage, $100 less than EVO8. |
| 5x5+ | HLG 750 Diablo | $999 | IONFRAME EVO10 | $999 | Same price. EVO10 pushes 1000W for big rooms. HLG stays efficient. |
Not from the marketing teams. From growers, forum threads, and our own experience on the shop floor.
American-designed • Est. 2016
UIS Ecosystem • Smart Control
Breaking down every factor that actually matters when choosing between these two.
The numbers that determine your electric bill and your yield.
HLG publishes real efficiency numbers and they're consistently among the best in the industry. The 750 Diablo hits 2.86 μmol/J — that means it puts out the same usable light as a 1000W HPS while pulling only 715W from the wall. Growers in side-by-side tests have documented 1,089g per light with the 750 Diablo.
AC Infinity uses Samsung LM301H EVO diodes — the newest generation — but here's the thing that bothers us: they don't publish independent PAR efficacy numbers for the EVO series. That's a red flag when your competitor is openly posting 2.86 μmol/J. If your numbers were better, you'd publish them. The IONBOARD series with standard LM301H diodes is competitive, but the EVO line's true efficiency is an open question.
Edge: HLG — published, verified, and consistently top-tier.
How evenly the light covers your canopy matters more than peak PPFD.
This is where AC Infinity fights back. Their IONFRAME bar-style design spreads light more evenly across the canopy than HLG's quantum board layout. Quantum boards concentrate light in the center — some HLG models show up to 37% uniformity variance from center to edge. You can manage this with proper hanging height, but in shorter tents (under 7 feet), HLG boards struggle to spread evenly before the light reaches the canopy.
Bar-style lights like the IONFRAME spread diodes across 6-8 bars, so the light is already distributed before it travels down. Less hot spots, less light stress in the center, more consistent bud development at the edges. If your tent has low ceilings, this matters a lot.
Edge: AC Infinity — bar-style design wins on uniformity, especially in shorter spaces.
One brand has an app. The other has a knob.
There's no contest here. AC Infinity's UIS platform lets you control your lights, inline fans, humidity controllers, and temperature sensors from a single app. You can set dimming schedules, program sunrise/sunset transitions to reduce heat stress, and monitor your grow room remotely. If you travel for work or just don't want to babysit your tent every day, this is genuinely useful.
HLG has a dimmer knob. That's it. No app, no scheduling, no integration with anything. For growers who set their light to 100% in flower and never touch it again, this is fine. But if you want automation, HLG doesn't even compete in this category.
Edge: AC Infinity — not even close.
What's going to hold up after 3 years of 12/12 cycles.
HLG lights are tanks. Heavy aluminum heatsinks, solid construction, and a reputation for lasting. The downside of that build quality is weight — the 750 Diablo is noticeably heavier than the IONFRAME EVO8, which makes height adjustments more of a production. Some growers have reported thermal concerns on long-term runs, but these are edge cases.
AC Infinity's IONFRAME has a clever advantage: the driver is detachable. Mount it outside your tent and you immediately reduce heat inside by roughly 15%. In a 4x4 tent during summer, that can be the difference between running your AC or not. However, we've seen reports of bad driver batches and controller communication failures — when everything works, it's great, but QC hasn't been as tight as HLG's.
Edge: Split — HLG for raw durability, AC Infinity for thermal management.
What happens when something goes wrong.
HLG offers a 5-year warranty with UL 8800 certification. They're a smaller American company, and growers report actually getting a human on the phone when they call. The online community is massive — if you have a question about an HLG light, someone on a forum has already answered it.
AC Infinity's warranty coverage is standard, but their customer service has been a sore point. We've heard from customers about unreachable phone lines and dropped calls. Their warranty process through retailers like us is straightforward, but direct support can be frustrating. That said, buying through a local dealer means you deal with us either way.
Edge: HLG — 5-year warranty and actual phone support.
Lights don't exist in a vacuum. What else are you running?
If you already own AC Infinity inline fans, carbon filters, or controllers — and a lot of growers do, because their ventilation gear is excellent — then adding an IONFRAME light means everything talks through one app. Set your fan to kick up when the light hits 100%, program your lights to dim during the hottest part of the day, monitor everything from your phone. That's a real workflow improvement.
HLG is a lighting company. They make lights and that's it. There's no ecosystem play. But here's the thing — one of our most popular combos is HLG lights with AC Infinity fans. They work together just fine. You just can't control the HLG dimmer from the AC Infinity app. Most growers don't care. They set the light, forget it, and let the AC Infinity controller handle climate.
Edge: AC Infinity — if you're building a full ecosystem. Neutral if you're mixing brands.
Specific situations, specific recommendations. No hedging.
You want a reliable light that won't break the bank. You're still figuring out nutrients and watering schedules — you don't need another app to learn right now. You just need good light.
Buy: AC Infinity IONBOARD S44 ($379) — best value 4x4 light on the market.
You've dialed in your environment, nutrients, and training. Now you want every photon you can get. Efficiency and PAR output are what matter to you. You'll adjust height manually without complaining.
Buy: HLG 350 Diablo ($549) for 4x4 or HLG 750 Diablo ($999) for 5x5.
You already run AC Infinity fans. You like controlling everything from your phone. You want sunrise/sunset scheduling and remote monitoring. You value convenience as much as raw output.
Buy: IONFRAME EVO6 ($500) for 4x4 or IONFRAME EVO8 ($799) for 5x5.
Your grow space has limited vertical clearance. You need a light that spreads evenly without hanging it 24 inches above the canopy. Hot spots will burn your plants in a short tent.
Buy: AC Infinity IONFRAME (bar-style). The spread is better at close range than HLG quantum boards.
You need a dedicated light for your propagation area. Low wattage, gentle spectrum, doesn't cook young plants. Budget matters here — it's a utility light, not your main flower fixture.
Buy: IONBOARD S22 ($119) — $30 cheaper than the HLG 100 and does the same job.
You want serious 5x5 coverage but the $999 HLG 750 Diablo price tag stings. You're looking for the sweet spot between performance and cost.
Buy: HLG 750 Diablo ES ($699) — enhanced spectrum, same 5x5 coverage, $300 less than the standard Diablo.
Is HLG worth the premium over AC Infinity?
It depends on what you value. HLG lights consistently deliver top-tier PAR efficiency — the 750 Diablo hits 2.86 μmol/J, and growers routinely pull over a pound per light. You're paying for proven yields and a 5-year warranty. But if you want app control, scheduling, and ecosystem integration with fans and controllers, AC Infinity gives you that at a lower price point. For raw output per dollar, HLG wins. For convenience and automation, AC Infinity wins.
Does AC Infinity make good grow lights?
Yes, with caveats. Their IONBOARD and IONFRAME lines use Samsung LM301H EVO diodes — the latest generation — and the bar-style IONFRAME design produces excellent canopy uniformity. The UIS app integration is genuinely useful. However, AC Infinity does not publish independent PAR efficacy numbers for the EVO series, and some models like the IONFRAME EVO8 and EVO10 lack far-red diodes despite marketing materials suggesting otherwise. They're a newer player in grow lights compared to HLG, so the long-term track record is still being written.
Can I mix HLG lights with AC Infinity fans?
Absolutely. This is actually one of the most popular setups we sell. HLG lights for raw output, AC Infinity inline fans and controllers for climate management. The lights don't need to talk to the fans — your AC Infinity controller handles temperature and humidity independently. You just lose the ability to dim your lights from the AC Infinity app, which most growers don't care about since HLG's manual dimmer works fine.
Which brand has better customer service?
HLG has a strong reputation for customer support — they're a smaller American company and growers report getting real humans on the phone. AC Infinity's support has been inconsistent — we've heard complaints about unreachable phone lines and dropped calls, though their warranty process through retailers is straightforward. For direct support, HLG has the edge. That said, buying from a local dealer like us means you deal with us for support either way.
HLG Diablo vs IONFRAME for a 4x4 tent?
For a 4x4, you're comparing the HLG 350 Diablo ($549) against the AC Infinity IONFRAME EVO6 ($500). The HLG 350 Diablo is a quantum board design with a cult following — growers consistently pull over a pound with it. The IONFRAME EVO6 is a bar-style light with app control and a detachable driver. If you already run AC Infinity fans and want everything in one app, go EVO6. If you want proven yields and don't care about smart features, go Diablo. Both are excellent lights. You won't regret either one.