Grow Light Theory

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Far-Red 730 nm: Why It's Added to Grow Lights and How Much You Actually Need

Far-red 730 nm: why it is added to grow lights and how much you need. The Emerson effect without th…

02 Aug 2026 Read →

How Much Light Does the Sun Give: PPFD and DLI by Latitude, Season and Cloud Cover — With a Visual Simulator

Why do plants struggle on winter windowsills? Use our interactive solar calculator and grow light w…

29 Jul 2026 Read →

PPFD Calculator: How to Convert Lux to PPFD by Lamp Spectrum

A lux meter costs pennies; a quantum meter costs hundreds. Our PPFD calculator turns any lux meter …

22 Jul 2026 Read →

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DIY, Lighting and Electrical

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PPFD & PAR Map Simulator for Grow Tents

PPFD calculator for grow tents: build a PAR map grid, check coverage and uniformity, read the PPFD…

19 Aug 2026 Read →

Lighting Calculator: Lux, Uniformity and Glare to EN 12464-1

Room illuminance calculator: lux, UGR, and W/m² according to EN 12464-1. Calculate the number of lu…

18 Aug 2026 Read →

SunLike LED Spectrum Mixer: The Perfect Custom Light for Duv

How to properly mix SunLike LEDs, avoiding DUV and MacAdam step errors. A review of the SunLike LED…

16 Aug 2026 Read →

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LED news

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What's really soldered onto your Quantum boards from AliExpress? Samsung LED's exit from the LED market

Samsung has officially ended production of the LM301H EVO and the entire LM301 line — the last ship…

28 Jul 2026 Read →

Review of the new Seoul SZDR5A0G phytoLED: 660nm evolution and comparison with the Osram Osconiq GH PUBRA1.25

A detailed review of the new Seoul SZDR5A0G (660 nm Deep Red S1CH-3535660002-0000000) LED for plant…

21 Jul 2026 Read →

Acrich technology from Seoul Semiconductor or LEDs 220 volt

The History of Acrich Technology from Seoul Semiconductor. Direct-on-Board (DOB) AC LED Matrices: D…

02 Jul 2026 Read →

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Electronics, equipment and smart lighting

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Our equipment and software for measuring LED and LED lamp parameters

How and with what we measure the parameters of a phytolamp: the Ocean Optics STS-VIS spectrometer c…

23 Jul 2026 Read →

Resistor Color Code: Online Calculator

Need to find a resistor's value? Use our accurate resistor color code calculator for resistors. Res…

28 Jun 2026 Read →

Power supply (or transformerless LED driver) on a quenching capacitor, calculation

Understanding how a transformerless power supply based on a dropper capacitor works. How to design …

27 Jun 2026 Read →

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Electricity and solar energy

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How to Choose a Circuit Breaker: Rating, B, C or D Curve and Sizing by Power

A breaker protects the cable, not the load. The coordination rule, what separates B, C and D curves…

04 Aug 2026 Read →

Solar Panel Output Calculator: Accurate PV Generation, Payback & Tilt Angle

Accurate solar panel output calculator. Estimate annual PV generation, optimum tilt angle, and payb…

03 Aug 2026 Read →

Wire Gauge & Voltage Drop Calculator: AC/DC, Single & Three Phase

Online wire gauge and voltage drop calculator. Convert AWG to mm², calculate size for AC/DC, 1 and …

02 Aug 2026 Read →

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Industrial and domestic LED lighting

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Color Rendering Index CRI, CQS and TM-30 standard in LED lighting, flicker issues

What is color rendering index (CRI), TM-30, and CQS? Explore lighting standards, spectrum quality. …

23 Aug 2026 Read →

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