LightLAB PRO vs Lumen Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LightLAB PRO
This app provides professional lighting analysis tools for photographers, videographers, and lighting professionals. It measures various light parameters with high accuracy, including exposure, color temperature, and white point, and can scan light spectra.
- Measure lighting level
- Calculate exposure level (EV)
- Determine color temperature (Kelvin)
- Measure aperture value (f stop)
- Calculate exposure time
- Scan light spectrum
- Analyze light spectrum components and wavelengths
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LightLAB PRO is the direct evolution of LuxMeterPro. this transformation makes LightLAB PRO a flexible, accurate and indispensable tool for those who need a device that offers professional features at a very low cost. LightLAB PRO finds its utility both in lighting applications and in the world of photographs and video makers. among the main features of course, in addition to measuring the lighting level of an environment, in this version, which is more improved with a very high accuracy, it allows to measure a whole series of parameters that make LightLAB PRO a unique instrument. The parameters calculated and made available to the user are: The exposure level expressed in EV, the color temperature in KELVIN, the aperture value in f stop, the exposure time in fractions of a second 1 / s and other parameters like the coordinates of the white point and more. All these values are useful to those who work in photo-cinematography to correctly set the light sources so as to obtain the desired result quickly and without spending exaggerated sums to buy devices that do this work. in addition to the measurement of the parameters described above, it is also possible to customize some of them according to your needs. moreover it is possible to scan the light spectrum of the sources and evaluate with extreme accuracy the components and the wavelengths that make up the light that illuminates the scene. LightLAB PRO becomes a real light analysis laboratory providing all the necessary tools to get professional lighting without difficulty
Lumen Calculator
This physics and math tool quickly converts between lumens, lux, and candelas. It provides instant calculations with copyable results and includes reference formulas. Optimized for everyday use, it supports high precision and various units.
- Instant calculation
- Copyable results
- Reference formulas
- High precision (16 decimal places)
- Supports various units
- Ad-free and private
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The Lumen Calculator is a physics/math calculator designed to swiftly and easily convert between lumens, lux, and candelas. Features: - Instant calculation. - Results are copyable to other apps. - Formulas included as references. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. Definitions: - Lumens: Unit of luminous flux, representing the total amount of light emitted by a source. - Lux: Measure of surface illumination, indicating how much light is received by a surface. - Candelas: SI units of luminous intensity, representing light emitted from a source in a particular direction per steradian. Note: Candelas measure the light emitted in a specific direction, while lux measures the light received per unit area. One steradian, the area of the receiving surface, is equal to the squared distance between the source and the receiver. Formulas: 1. Lumens = Candelas * Ω (For a specific angle) 2. Lumens = Candelas * 2π * [1 - cos(θ/2)] 3. Lux = Lumens / Area 4. Lux = Candela / Distance² Where: Ω = 2π * [1 - cos(θ/2)] Ω = 4π Thanks for your support, and please visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
The clearest difference is update cadence: LightLAB PRO at every 2 months against Lumen Calculator's every 27 months. LightLAB PRO also leads on review sentiment (9% vs 0%) and iOS requirement (10.3 vs 13). Lumen Calculator's advantage is price ($2.99 vs $3.99). On ads, in-app purchases, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
LightLAB PRO costs $3.99 and Lumen Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LightLAB PRO ships an update every 2 months, Lumen Calculator every 27 months. The most recent releases landed on October 19, 2026 and October 13, 2026 respectively.
| Parameter | LightLAB PRO | Lumen Calculator |
|---|---|---|
| Price | $3.99 | $2.99 — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 8.6% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months — better | Every 27 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.3 — better | 13 |
| Further details — not scored | ||
| Size | 33 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | AM PowerSoftware | Nitrio |
Customer experience
LightLAB PRO
Lumen Calculator
Bugs and requests
LightLAB PRO
Reported bugs
406 issues- ⚫️ Black screen on launch
- 🐛 App crashes
- 🐛 Freezes from time to time
- 🐛 App closes immediately
- 🐛 App crashes on launch
Show 401 moreShow fewer
- 🐛 Rare to open without crashing
- 🐛 Flashes and shuts off
- 🐛 Crashes endlessly
- 🐛 Immediately crashes
- 🐛 Slow and not seeing cameras
- 🐛 No improvement after delete/reinstall
- 🐛 iOS 5.1 doesn't operate
- 🐛 Light measurement abnormal
- 🐛 Doesn't work since OS 5.1 update
- 🐛 Camera cannot be changed
- 🐛 No functions operate
- 🐛 Missing instructions
- 🐛 Bugs inside
- 🐛 Cannot calibrate
- 🐛 Switching lenses difficult
- 🐛 Not as good as free version
- 🐛 Interface loads, that's all
- 🐛 Flashes iPad layout, switches to iPhone
- 🐛 No function
- 🐛 Doesn't calibrate on iPhone 4
- 🐛 Support email bounced
- 🐛 Inconsistent readings
- 🐛 Almost useless
- 🐛 App does not work
- 🐛 Not working
- 🐛 Very different readings
- 🐛 Website no longer available
- 🐛 LUX is erroneous
- 🐛 Not a Lux meter
- 🐛 Measures reflected light, not lux
- 🐛 Inaccurate measurements
- 🐛 Wish I could get money back
- 🐛 Color temp is a joke
- 🐛 Guesses are better
- 🐛 Shows yellow HPS as 5300k
- 🐛 CFL and incandescent same
- 🐛 Faulty
- 🐛 Don't have confidence in results
- 🐛 Low lighting results way off
- 🐛 Instructions would be nice
- 🐛 Valid email address needed
- 🐛 Cannot measure lux with camera
- 🐛 Helper function leaves user alone
- 🐛 Camera too intelligent
- 🐛 White balance etc. shouldn't be in measurement
- 🐛 Cannot get usable lux measurement
- 🐛 Same for color temperature
- 🐛 Not a Pro Advanced feature
- 🐛 Requires user expertise
- 🐛 Not worth the money
- 🐛 Doesn't work on new iPad
- 🐛 Reverts to iPhone size image
- 🐛 Total failure on new iPad
- 🐛 Surface and operation fine, no measurement
- 🐛 Switch doesn't turn on
- 🐛 Thrown away money
- 🐛 Does not work on iPhone 4s
- 🐛 Friend uses on iPhone 4 without problem
- 🐛 Hope for quick update
- 🐛 Screen dimensions cut off
- 🐛 Results vary too much
- 🐛 Data is useless
- 🐛 Screen cut off on right/bottom
- 🐛 Needs major revision
- 🐛 All I get is a black screen
- 🐛 Please get back to me
- 🐛 Black screen, doesn't work
- 🐛 Waste of money
- 🐛 Worked good on 5, black screen on 6
- 🐛 Difficult to use
- 🐛 Need expert knowledge
- 🐛 Still struggling to use
- 🐛 Kelvin meter is doubtful
- 🐛 Feels like analyzing image
- 🐛 Completely worthless app
- 🐛 Bears no relation to reality
- 🐛 Written in illiterate English
- 🐛 Functions unusable
- 🐛 Why?
- 🐛 Is there a way?
- 🐛 Black screen on iPhone 5
- 🐛 Doesn't work since iOS 6
- 🐛 Black screen after launch
- 🐛 Immediately black screen
- 🐛 App closes immediately
- 🐛 Expecting quick update
- 🐛 Inconsistent readings
- 🐛 Almost useless
- 🐛 App does not work
- 🐛 Not working
- 🐛 Very different readings
- 🐛 Website no longer available
- 🐛 LUX is erroneous
- 🐛 Not a Lux meter
- 🐛 Measures reflected light, not lux
- 🐛 Inaccurate measurements
- 🐛 Wish I could get money back
- 🐛 Color temp is a joke
- 🐛 Guesses are better
- 🐛 Shows yellow HPS as 5300k
- 🐛 CFL and incandescent same
- 🐛 Faulty
- 🐛 Don't have confidence in results
- 🐛 Low lighting results way off
- 🐛 Instructions would be nice
- 🐛 Valid email address needed
- 🐛 Cannot measure lux with camera
- 🐛 Helper function leaves user alone
- 🐛 Camera too intelligent
- 🐛 White balance etc. shouldn't be in measurement
- 🐛 Cannot get usable lux measurement
- 🐛 Same for color temperature
- 🐛 Not a Pro Advanced feature
- 🐛 Requires user expertise
- 🐛 Not worth the money
- 🐛 Doesn't work on new iPad
- 🐛 Reverts to iPhone size image
- 🐛 Total failure on new iPad
- 🐛 Surface and operation fine, no measurement
- 🐛 Switch doesn't turn on
- 🐛 Thrown away money
- 🐛 Slow and not seeing cameras
- 🐛 No improvement after delete/reinstall
- 🐛 iOS 5.1 doesn't operate
- 🐛 Light measurement abnormal
- 🐛 Doesn't work since OS 5.1 update
- 🐛 Camera cannot be changed
- 🐛 No functions operate
- 🐛 Please fix
- 🐛 Missing instructions
- 🐛 Bugs inside
- 🐛 Cannot calibrate
- 🐛 Switching lenses difficult
- 🐛 Not as good as free version
- 🐛 Interface loads, that's all
- 🐛 Don't download it
- 🐛 Do not buy this app
- 🐛 Does not work for lux or color temp
- 🐛 Cannot calibrate
- 🐛 Not linear
- 🐛 Color temp not close
- 🐛 Save your money
- 🐛 500k increments too large
- 🐛 Not usable for shooting
- 🐛 Approximate calibration
- 🐛 No parameter saving
- 🐛 Color temperature scale not useful
- 🐛 No support
- 🐛 No instructions available
- 🐛 No part works accurately
- 🐛 Product blows
- 🐛 100% true on iPhone 4
- 🐛 Fix this app
- 🐛 Dishonest chiselers
- 🐛 Does not work at all
- 🐛 Company sells many similar apps
- 🐛 Bought two, neither work
- 🐛 Please fix or refund
- 🐛 Not suitable for iPad
- 🐛 Image appears tiny
- 🐛 In one corner of the screen
- 🐛 Could not get it to work
- 🐛 Flashes iPad layout, switches to iPhone
- 🐛 No function
- 🐛 Annoying
- 🐛 Too expensive
- 🐛 No interaction with internal camera
- 🐛 No way to measure anything
- 🐛 Several versions of this crap
- 🐛 Developer's intentions?
- 🐛 Does not work on iPhone 4s
- 🐛 Friend uses on iPhone 4 without problem
- 🐛 Hope for quick update
- 🐛 Screen dimensions cut off
- 🐛 Results vary too much
- 🐛 Data is useless
- 🐛 Screen cut off on right/bottom
- 🐛 Needs major revision
- 🐛 All I get is a black screen
- 🐛 Please get back to me
- 🐛 Black screen, doesn't work
- 🐛 Waste of money
- 🐛 Worked good on 5, black screen on 6
- 🐛 Difficult to use
- 🐛 Need expert knowledge
- 🐛 Still struggling to use
- 🐛 Kelvin meter is doubtful
- 🐛 Feels like analyzing image
- 🐛 Completely worthless app
- 🐛 Bears no relation to reality
- 🐛 Written in illiterate English
- 🐛 Functions unusable
- 🐛 Why?
- 🐛 Is there a way?
- 🐛 Black screen on iPhone 5
- 🐛 Doesn't work since iOS 6
- 🐛 Black screen after launch
- 🐛 Immediately black screen
- 🐛 App closes immediately
- 🐛 Expecting quick update
- 🐛 Inconsistent readings
- 🐛 Almost useless
- 🐛 App does not work
- 🐛 Not working
- 🐛 Very different readings
- 🐛 Website no longer available
- 🐛 LUX is erroneous
- 🐛 Not a Lux meter
- 🐛 Measures reflected light, not lux
- 🐛 Inaccurate measurements
- 🐛 Wish I could get money back
- 🐛 Color temp is a joke
- 🐛 Guesses are better
- 🐛 Shows yellow HPS as 5300k
- 🐛 CFL and incandescent same
- 🐛 Faulty
- 🐛 Don't have confidence in results
- 🐛 Low lighting results way off
- 🐛 Instructions would be nice
- 🐛 Valid email address needed
- 🐛 Cannot measure lux with camera
- 🐛 Helper function leaves user alone
- 🐛 Camera too intelligent
- 🐛 White balance etc. shouldn't be in measurement
- 🐛 Cannot get usable lux measurement
- 🐛 Same for color temperature
- 🐛 Not a Pro Advanced feature
- 🐛 Requires user expertise
- 🐛 Not worth the money
- 🐛 Doesn't work on new iPad
- 🐛 Reverts to iPhone size image
- 🐛 Total failure on new iPad
- 🐛 Surface and operation fine, no measurement
- 🐛 Switch doesn't turn on
- 🐛 Thrown away money
- 🐛 Slow and not seeing cameras
- 🐛 No improvement after delete/reinstall
- 🐛 iOS 5.1 doesn't operate
- 🐛 Light measurement abnormal
- 🐛 Doesn't work since OS 5.1 update
- 🐛 Camera cannot be changed
- 🐛 No functions operate
- 🐛 Please fix
- 🐛 Missing instructions
- 🐛 Bugs inside
- 🐛 Cannot calibrate
- 🐛 Switching lenses difficult
- 🐛 Not as good as free version
- 🐛 Interface loads, that's all
- 🐛 Don't download it
- 🐛 Do not buy this app
- 🐛 Does not work for lux or color temp
- 🐛 Cannot calibrate
- 🐛 Not linear
- 🐛 Color temp not close
- 🐛 Save your money
- 🐛 500k increments too large
- 🐛 Not usable for shooting
- 🐛 Approximate calibration
- 🐛 No parameter saving
- 🐛 Color temperature scale not useful
- 🐛 No support
- 🐛 No instructions available
- 🐛 No part works accurately
- 🐛 Product blows
- 🐛 100% true on iPhone 4
- 🐛 Fix this app
- 🐛 Dishonest chiselers
- 🐛 Does not work at all
- 🐛 Company sells many similar apps
- 🐛 Bought two, neither work
- 🐛 Please fix or refund
- 🐛 Not suitable for iPad
- 🐛 Image appears tiny
- 🐛 In one corner of the screen
- 🐛 Could not get it to work
- 🐛 Flashes iPad layout, switches to iPhone
- 🐛 No function
- 🐛 Annoying
- 🐛 Too expensive
- 🐛 No interaction with internal camera
- 🐛 No way to measure anything
- 🐛 Several versions of this crap
- 🐛 Developer's intentions?
- 🐛 Does not work on iPhone 4s
- 🐛 Friend uses on iPhone 4 without problem
- 🐛 Hope for quick update
- 🐛 Screen dimensions cut off
- 🐛 Results vary too much
- 🐛 Data is useless
- 🐛 Screen cut off on right/bottom
- 🐛 Needs major revision
- 🐛 All I get is a black screen
- 🐛 Please get back to me
- 🐛 Black screen, doesn't work
- 🐛 Waste of money
- 🐛 Worked good on 5, black screen on 6
- 🐛 Difficult to use
- 🐛 Need expert knowledge
- 🐛 Still struggling to use
- 🐛 Kelvin meter is doubtful
- 🐛 Feels like analyzing image
- 🐛 Completely worthless app
- 🐛 Bears no relation to reality
- 🐛 Written in illiterate English
- 🐛 Functions unusable
- 🐛 Why?
- 🐛 Is there a way?
- 🐛 Black screen on iPhone 5
- 🐛 Doesn't work since iOS 6
- 🐛 Black screen after launch
- 🐛 Immediately black screen
- 🐛 App closes immediately
- 🐛 Expecting quick update
- 🐛 Inconsistent readings
- 🐛 Almost useless
- 🐛 App does not work
- 🐛 Not working
- 🐛 Very different readings
- 🐛 Website no longer available
- 🐛 LUX is erroneous
- 🐛 Not a Lux meter
- 🐛 Measures reflected light, not lux
- 🐛 Inaccurate measurements
- 🐛 Wish I could get money back
- 🐛 Color temp is a joke
- 🐛 Guesses are better
- 🐛 Shows yellow HPS as 5300k
- 🐛 CFL and incandescent same
- 🐛 Faulty
- 🐛 Don't have confidence in results
- 🐛 Low lighting results way off
- 🐛 Instructions would be nice
- 🐛 Valid email address needed
- 🐛 Cannot measure lux with camera
- 🐛 Helper function leaves user alone
- 🐛 Camera too intelligent
- 🐛 White balance etc. shouldn't be in measurement
- 🐛 Cannot get usable lux measurement
- 🐛 Same for color temperature
- 🐛 Not a Pro Advanced feature
- 🐛 Requires user expertise
- 🐛 Not worth the money
- 🐛 Doesn't work on new iPad
- 🐛 Reverts to iPhone size image
- 🐛 Total failure on new iPad
- 🐛 Surface and operation fine, no measurement
- 🐛 Switch doesn't turn on
- 🐛 Thrown away money
- 🐛 Slow and not seeing cameras
- 🐛 No improvement after delete/reinstall
- 🐛 iOS 5.1 doesn't operate
- 🐛 Light measurement abnormal
- 🐛 Doesn't work since OS 5.1 update
- 🐛 Camera cannot be changed
- 🐛 No functions operate
- 🐛 Please fix
- 🐛 Missing instructions
- 🐛 Bugs inside
- 🐛 Cannot calibrate
- 🐛 Switching lenses difficult
- 🐛 Not as good as free version
- 🐛 Interface loads, that's all
- 🐛 Don't download it
- 🐛 Do not buy this app
- 🐛 Does not work for lux or color temp
- 🐛 Cannot calibrate
- 🐛 Not linear
- 🐛 Color temp not close
- 🐛 Save your money
- 🐛 500k increments too large
- 🐛 Not usable for shooting
- 🐛 Approximate calibration
- 🐛 No parameter saving
- 🐛 Color temperature scale not useful
- 🐛 No support
- 🐛 No instructions available
- 🐛 No part works accurately
- 🐛 Product blows
- 🐛 100% true on iPhone 4
- 🐛 Fix this app
- 🐛 Dishonest chiselers
- 🐛 Does not work at all
- 🐛 Company sells many similar apps
- 🐛 Bought two, neither work
- 🐛 Please fix or refund
- 🐛 Not suitable for iPad
- 🐛 Image appears tiny
- 🐛 In one corner of the screen
- 🐛 Could not get it to work
- 🐛 Flashes iPad layout, switches to iPhone
- 🐛 No function
- 🐛 Annoying
- 🐛 Too expensive
- 🐛 No interaction with internal camera
- 🐛 No way to measure anything
- 🐛 Several versions of this crap
- 🐛 Developer's intentions?
- 🐛 Does not work on iPhone 4s
- 🐛 Friend uses on iPhone 4 without problem
- 🐛 Hope for quick update
Requested features
39 requests- 💡 Circle in the middle for measurement
- 💡 Changeable circle size
- 💡 More detailed calibration instructions
- 💡 Ability to add own light sources
- 💡 Dark mode option
Show 34 moreShow fewer
- 💡 Advanced analytics dashboard
- 💡 Update for iOS 5.1
- 💡 Fix for iPhone 4s
- 💡 Fix for iPad 2
- 💡 Fix for iPhone 4
- 💡 Fix for iPhone 6
- 💡 Fix for iPhone 6 Plus
- 💡 Fix for iPhone 6s
- 💡 Fix for iPhone 6s Plus
- 💡 Fix for iPad Air
- 💡 Fix for iOS 7
- 💡 Fix for iOS 8.02
- 💡 Fix for iOS 10
- 💡 Fix for iOS 6
- 💡 Fix for iOS 6.0.1
- 💡 Fix for iOS 5.1
- 💡 Fix for iOS 4.21
- 💡 Fix for iPad
- 💡 Fix for iPad 2
- 💡 Fix for iPhone 5
- 💡 Fix for iPhone 5s
- 💡 Fix for iPhone 4s
- 💡 Fix for iPhone 4
- 💡 Fix for iPhone 3GS
- 💡 Fix for iPhone
- 💡 Fix for all devices
- 💡 More detailed documentation
- 💡 Clearer instructions
- 💡 Better GUI
- 💡 Step-by-step calibration guide
- 💡 Explanation of compensation, linear, offset
- 💡 Ability to save settings
- 💡 More precise color temperature measurement
- 💡 Ability to change camera
Lumen Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
LightLAB PRO
No in-app purchases
Lumen Calculator
No in-app purchases
Questions
Is LightLAB PRO free?
Is Lumen Calculator free?
Do LightLAB PRO or Lumen Calculator have ads?
Which is updated more often, LightLAB PRO or Lumen Calculator?
Other comparisons















