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Lux meter for plants

Updated: 22 October 2026

UK reviews on these amazon.co.uk meters are full of people who move a pot and decide the sill is brighter than the corner. That is a fair use of a lux meter for plants, and a narrow one. The figure says which spot is brighter to a human eye under the lamp you already own. It does not say the plant has enough light, and it does not hand you a lux target to copy. The [lux meter comparison](/hub/measuring-equipment/lux-meter) is the hardware table. Peter F. used UK horticultural guidance and the review notes in this capture. We did not grow a trial. A qualifying purchase can earn a commission at no extra cost to you.

UK reviews on these amazon.co.uk meters are full of people who move a pot and decide the sill is brighter than the corner. That is a fair use of a lux meter for plants, and a narrow one.

Our top picks

TopTes TopTes TS-710

Best overall

TopTes TopTes TS-710
8.2/10about £29.99
View offer
Dr.meter Dr.meter 1010BS split

Best value

Dr.meter Dr.meter 1010BS split
6.1/10about £18.99
View offer
URCERI URCERI handheld

Alternative

URCERI URCERI handheld
6.8/10about £29.99
View offer
On this page
  1. 1.Why the reviews talk about plants
  2. 2.What the meter actually weighs
  3. 3.A comparison you can still make
  4. 4.When lux is the wrong tool

Why the reviews talk about plants

Houseplants dominate the UK notes. The Dr.meter 1010BS is used on carnivorous plants and on corners that were darker than they looked. V·Resourcing reviews compare grow lights. The URCERI handheld is used to place pots. Titles that say "for plants" are marketing. They do not mean the meter reads photosynthetically active radiation. The useful job is which shelf is dimmer under this lamp. Keep the lamp, the height, and the time of day fixed, and move the sensor. The higher reading is the brighter spot to the eye. Whether the species wanted that is your knowledge of the plant, not a threshold on the bezel. The head you can place is the lux meter buying guide.

What the meter actually weighs

Lux follows the eye. It responds most where people see yellow-green as bright, and less at deep red and blue. Photosynthetic photon flux density counts photons from about 400 to 700 nanometres more evenly. A lux meter does not. AHDB's Project Blue note says a lux meter is more informative under high-pressure sodium and is the wrong quantity under red-and-blue LEDs. A purple bar can look weak while the crop still responds. Under one white LED or a window, two spots are still comparable. Do not stack a blurple reading against a white-bulb reading.
TopTes TopTes TS-710

Testsieger

TopTes TopTes TS-710
8.2/10about £29.99
View offer

A comparison you can still make

Use one lamp at the height you actually run. Put the sensor at the leaves, flat, cell towards the lamp, and get your head out of the beam. Read lux, not foot-candles. Write the lamp, the distance, and the time, then move only the sensor. The higher number is the brighter spot to the eye under that lamp. You cannot call 10,000 lux, or any other round figure, enough. This capture supports no growth threshold. The TS-710 states a 180° head. The split 1010BS and MT-92H leave the cell among the pots. The 1010BS stops at 100,000 lux and needs its ×10 multipliers. Repeat another day only if the note matches. How you lay the cell is how to use a lux meter.

When lux is the wrong tool

Move to a quantum meter, reading PPFD, when you need plant-useful light on the canopy. That is a different instrument from every row here. Migro, a UK grow-light seller, has published a lux-to-PAR factor for white spectra they tested with particular meters. The factor belongs to those lamps and those meters. It is not a constant for these twelve ASINs. Do not stamp it onto a TS-710 and call the screen micromoles. For one white lamp and a row of pots, lux is enough to arrange them. For a recipe in micromoles, leave lux behind.

Common questions

Can I use a lux meter on houseplants?
Yes, to compare spots under one lamp you can name. UK reviewers do that with the 1010BS, both V·Resourcing listings, the URCERI handheld, and the LX1330B. The higher reading is brighter to the eye. It is not a feeding plan for the species, and a title that says "for plants" does not add a plant sensor to the cell.
Why is my purple LED a low lux reading?
Lux follows the eye, and red-blue light sits where that curve is low. Project Blue's horticulture note says lux meters suit high-pressure sodium better than red-blue LEDs. A low number can sit next to plants that are still getting useful photons. Do not raise the lamp on lux alone. Compare two positions under that same bar, or measure PPFD.
Is there a lux number that means enough?
Not one this page can give you. A copied target pretends the eye's curve is the plant's, and it ignores your spectrum. Rank positions under one fixture. Let the plant, and a quantum meter if you need photons, decide what enough means. A round lux figure from a forum is not a result from these listings.
Should I read lux or PPFD?
Read lux to compare places under a known white lamp or a window. Read PPFD when you need plant-useful light, especially from LEDs that are not white. PPFD needs a quantum sensor, and none of these twelve is that sensor. A seller's conversion from their own white-LED test does not transfer onto these models.
Will a phone app do this instead?
It can suggest that one side of the sill is dimmer, if you hold it the same way. It will not sit at leaf height with a cap, and URCERI reviewers did not trust apps against another meter. It is also not a PPFD meter. Use it as a hint. Use a handheld when you will compare the shelf again.
Which meter is easier inside a tent?
A split sensor or a swivel beats a body you must lean in with. The 1010BS and the MT-92H keep the cell in the canopy and the screen out of your shadow. The TS-710 states 180°. The WapoRich states 270° with almost no UK reviews. Fixed heads still appear in plant reviews. They are clumsier when your shoulder blocks the lamp.
Does the temperature tell me the leaf temperature?
No. The digit, where the listing has one, is ambient air at the meter, and UK reviews often do not trust it. It is not the leaf. Do not move a plant because that channel looked low. If leaf temperature matters, measure the leaf with a method meant for a leaf.

Related pages

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Lux meter vs phone app for a number you will quote

Sources

Public UK sources from the research digest, last checked on 19 October 2026. Shelf prices and star lines are the amazon.co.uk figures captured with these twelve listings. The price bands are this set, not a market average.

  1. Workplace (Health, Safety and Welfare) Regulations 1992, regulation 8 (retrieved 19 October 2026)
  2. HSE HSG38: Lighting at work (retrieved 19 October 2026)
  3. HSE: Lighting (retrieved 19 October 2026)
  4. HSE L24: Workplace health, safety and welfare (retrieved 19 October 2026)
  5. ILP Guidance Note 7: Choosing a photometer or illuminance meter (retrieved 19 October 2026)
  6. LIA TS23 (retrieved 19 October 2026)
  7. CIBSE LG7: Lighting for offices (2023) (retrieved 19 October 2026)
  8. Michigan State University: Light into perspective (retrieved 19 October 2026)