About the name: Eyourlife (written EyourLife on this site, and often shortened to “Eyour”) is a set of free lighting calculators and guides at eyourlife.com. It covers room lumens and lux, beam angle, LED strip power supplies, watts to lumens and battery runtime.

LED lighting · Light fittings · Car lighting

EyourLife lighting calculators for home and car lights

Free calculators that answer practical lighting questions from the numbers on your packaging or datasheet: how many lumens a room needs, how wide a spotlight or light bar beam spreads at a distance, and how many hours a battery can run your LED lights. Each page shows its formula, units, sources and limits.

Room lux calculator Beam angle calculator Battery runtime calculator
θ
Featured Interactive Tool

Free LED Battery Runtime & Pack Size Calculator

Planning camping lights, 12V vehicle LED bars, or portable battery-powered lighting? Quickly calculate exact run hours, current draw, and battery pack capacity in Ah or Wh with depth-of-discharge and efficiency adjustments.

Try Battery Runtime Calculator Explore All 5 Calculators

Free lighting calculators

All calculators

The calculators only use what you enter and the sourced values shown on each page. They cannot measure a real lamp, battery or room.

What each calculator answers

  • How bright should this room be?

    The room lux calculator takes the floor area and a target illuminance (EN 12464-1 reference values are listed) and gives the total lumens needed and, if you enter one fitting’s lumens, how many fittings that takes.

  • How wide will the beam be?

    The beam angle calculator gives the spot diameter from distance and beam angle, for a downlight, a spotlight or a vehicle light bar or work light, or works back to the beam angle you need.

  • How long will the battery last?

    The battery runtime calculator estimates hours from capacity (Ah, mAh or Wh), voltage and power draw, allowing for usable capacity and converter losses.

  • Which bulb gives the same light?

    The lumens to watts calculator converts lumens to watts and compares LED, CFL, halogen and incandescent bulbs by light output, using efficacy values with their sources.

  • What power supply does my LED strip need?

    The LED strip power supply calculator adds up watts and amps for the strip length and adds the headroom you choose.

  • What color temperature should I choose?

    The color temperature calculator simulates 2700K (warm white) to 6500K (daylight) with a real-time preview and room recommendations for bedrooms, living rooms, and offices.

  • What size power station do I need for backup or camping?

    The portable power station calculator estimates running watts, peak surge power, and battery storage capacity (Wh) with inverter efficiency and safety margins for home outages and outdoor trips.

Light bars and car lights

This site has no shop or product pages. For a light bar or work light you are comparing, take the beam angle and power draw from the manufacturer’s datasheet: the beam angle calculator shows how wide the light spreads at a given distance, and the battery runtime calculator estimates how long a 12 V battery could run it with the engine off. Whether a light may be used on public roads depends on the rules where you drive; check your vehicle manual and the official vehicle lighting rules (see the disclaimer).

Articles

All articles

Frequently asked questions

What is the difference between lumens and lux?

Lumens (lm) measure the total light a lamp gives out. Lux (lx) measure how much of that light lands on a surface: one lux is one lumen per square metre. The room lux calculator links the two for a room.

Can these calculators measure my lights?

No. They only calculate from the numbers you enter, such as the values on a bulb’s packaging or a datasheet. Measuring real light needs a calibrated meter.

Does EyourLife say which car bulbs or lights may be used on the road?

No. Rules for vehicle lighting depend on the country and the vehicle. Check your vehicle manual and the official vehicle lighting rules where you drive.

Can I wire lights to mains electricity using these pages?

The calculators only cover figures such as power, current and runtime. Mains electrical work should be done by a qualified electrician following the wiring rules where you live.

How does EyourLife make money?

Some articles may include affiliate links. See the affiliate disclosure.

Cookie policy