Light Meter

Terms of Use

Last updated: 7 November 2026

These terms apply when you download or use Light Meter, an app from Itworked Systems, a company registered in Türkiye. By using it, you agree to them. If you downloaded the app from Apple's App Store, Apple's standard license agreement applies as well.

Using the app

We give you a personal right to use the app on devices you own or control. Please don't copy, resell or redistribute it. We may change or improve features with updates.

What the app can and cannot do

• Light Meter works out the light level from the exposure your phone's camera chooses for the scene. It is a practical guide for photographers and growers, not a calibrated lab instrument. Readings can differ from phone to phone and from a handheld meter; calibrate against one you trust for the best results.
• Suggested apertures and shutter speeds are rounded to the marked values you choose. Film, filters, lenses, shutters that run fast or slow, and long exposures (reciprocity) all change the result. The reciprocity times are based on formulas published by film makers.
• Lux, foot-candle, PPFD and daily light (DLI) values are estimates. PPFD and DLI are calculated from lux with typical factors for each kind of light; use a quantum (PAR) meter where exact values matter.
• We can't promise any particular photo or plant result.

Light Meter Pro

• The light meter is free. Light Meter Pro unlocks extra tools (spot metering, ⅓-stop values, camera and film presets, filters and exposure compensation, notes, and grow light estimates). It is sold through Apple or Google, under their terms, as a yearly subscription or a one-time lifetime purchase. The price and any free trial are shown in the app before you buy.
• Subscriptions renew automatically at the same price until you cancel. Cancel at least 24 hours before the end of the current period in your App Store or Google Play account settings; you keep Pro until the period ends. If a free trial is offered and you don't cancel before it ends, the subscription starts and is charged.
• Lifetime Pro stays unlocked. On a new phone, tap Restore purchases in Settings or on the Pro screen, signed in with the same Apple ID or Google account.
• Refunds are handled by Apple or Google under their refund rules. This does not limit any rights you have under the law of your country.

The app is ours

The app, its design, icon and name belong to Itworked Systems. Film names in the app belong to their makers and are used only to identify the films. Some parts of the app are open-source software used under their own licenses.

Our responsibility

We provide the app as it is, and cannot promise that it will always be accurate or free of errors. As far as the law allows, we are not responsible for losses that come from relying on its readings, such as an over or underexposed roll of film. Nothing in these terms limits responsibility that the law does not allow us to limit, or your rights as a consumer.

Changes to these terms

If we change these terms, we update this page and the date at the top.

Law

These terms are governed by the laws of the Republic of Türkiye, and disputes go to the competent courts and enforcement offices of Türkiye. If you are a consumer, you also keep the protection of the mandatory laws of the country where you live, and you can take a dispute to the courts or consumer bodies there.