# Light Meter LM vs ARC Facilities Premier

The clearest difference is rating: ARC Facilities Premier at 5.0 against Light Meter LM's 4.5. ARC Facilities Premier also leads on in-app purchases (none vs 3). Light Meter LM's advantage is ratings volume (2.6K vs 8) and iOS requirement (15.0 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Light Meter LM sells 3 in-app purchases, starting at $3.49 per month. ARC Facilities Premier asks for nothing beyond the download.

ARC Facilities Premier holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Light Meter LM has 2.6K ratings behind it against 8, so its average is the more settled of the two.

Light Meter LM ships an update monthly, ARC Facilities Premier every 3 weeks. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Light Meter LM | ARC Facilities Premier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.6K ratings)](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/arc-facilities-premier/id6739283887/reviews)** |
| Number of ratings | **2.6K** | 8 |
| Positive reviews | 40.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 22 MB | 269 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lightray Innovation GmbH](https://appshunter.io/developer/1031383431) | [ARC Document Solutions, LLC](https://appshunter.io/developer/540965287) |

## What reviewers say

### Light Meter LM

[App page](https://appshunter.io/ios/app/light-meter-lm-3000/id1554264761)

Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.

**Highlights:** Measure illuminance (lux/foot-candle), Measure color temperature (Kelvin), Industry-leading accuracy, Pre-calibrated for your device, Low light sensitivity, Save peak reading, Custom calibration option

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Continuous Charging | $3.49 | per month |
| Single Charge | $0.99 | one-time |
| Unlimited Battery | $19.99 | one-time |

**What reviewers like**

- 👍 Great app
- 👍 Accurate measurements
- 👍 Easy to use
- 👍 Helpful customer service
- 👍 Useful for science/research

**What reviewers complain about**

- 🐛 Requires diffuser for accurate readings
- 💰 Expensive for a light meter app
- 🔋 Battery/trial period issues
- 🔍 Inconsistent/inaccurate readings
- 🙄 Misleading/deceptive marketing

**Reported bugs**

- Diffuser not recognized even when used
- App locks up/crashes
- Constant diffuser pop-up interruptions

**Requested features**

- Ability to use rear camera
- More flexible diffuser options
- Improved accuracy without diffuser


### ARC Facilities Premier

[App page](https://appshunter.io/ios/app/arc-facilities-premier/id6739283887)

Access critical building information instantly from your mobile device. Technicians can quickly find As-Builts, shutoffs, equipment details, and emergency data. This app streamlines field operations, saving time and improving response to any situation.

**Highlights:** Instant access to building information, Locate As-Builts and shutoffs, QR code scanning for equipment details, Annotate maps and plans, Online and offline document access, Cloud synchronization, Compliance documentation management

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Light Meter LM free?

Light Meter LM is free to download, with in-app purchases available.

### Is ARC Facilities Premier free?

ARC Facilities Premier is free to download, with no in-app purchases.

### Which has better reviews, Light Meter LM or ARC Facilities Premier?

ARC Facilities Premier is rated higher. Light Meter LM averages 4.5 out of 5 from 2.6K ratings, while ARC Facilities Premier averages 5.0 from 8 ratings.

### Do Light Meter LM or ARC Facilities Premier have ads?

Neither Light Meter LM nor ARC Facilities Premier shows ads.

### Which is updated more often, Light Meter LM or ARC Facilities Premier?

Light Meter LM ships an update monthly, and ARC Facilities Premier every 3 weeks. Most recently, Light Meter LM was updated on November 11, 2026 and ARC Facilities Premier on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*