Fixture Reviews and Roundups

We have not tested any of these units. What we have done is read every published spec sheet, divide the figures against each other, and report what the manufacturer left out.

How we review a fixture we have not touched

Every other site in this category says it tested twenty grow lights. We have tested none, and we say so at the top of every page. What we do instead is a job that is genuinely useful and that nobody else seems to bother with: read every specification a manufacturer publishes, divide the figures against each other, and report exactly what is missing.

That turns out to be more revealing than it sounds. Of the nine fixtures in this section:

Three publish both photon output and efficacy — Mars Hydro, Spider Farmer, SANSI — which means their claims can be checked against each other. Spider Farmer’s pass: 249.21 µmol/s ÷ 100 W = 2.49 µmol/J against a published 2.5.
Three publish efficacy but not photon output — AC Infinity, VIVOSUN, and Soltech in part — so the output has to be derived and the claim cannot be cross-checked.
Three publish no photon data at all — ViparSpectra, Barrina, GooingTop. Two of those are among the best-selling grow lights on the market.

That distribution is the single most useful thing we can tell you about this category, and it is invisible from any individual product page.

What we can tell you, and what we cannot

The honest boundary of a specification-based review
We can tell you	We cannot tell you
Published photon output, and whether it divides correctly against the published wattage	Whether the fixture actually delivers its published output
Computed average PPFD over a stated area, with the arithmetic shown	Real PPFD at any point, which needs a meter and the unit in hand
Computed running cost from published wattage at your tariff	Whether the driver runs hot, buzzes, or fails in year three
Whether the form factor suits your shelf geometry	Build quality, fit and finish, or how the mounting hardware feels
Exactly which specifications a manufacturer declines to publish	Why they decline to publish them

What decides the price

Diodes, driver and dimming, roughly in that order. Fixtures naming Samsung LM301H or Bridgelux diodes cluster at the efficient end. Dimming adds cost and is genuinely worth it if the fixture will ever sit over young seedlings. Beyond that, a substantial part of the price spread in this category is appearance — a pendant that belongs in a living room costs several times a bar of equivalent output and is usually less efficient.

The mistake nearly everyone makes

Trusting a review that claims hands-on testing without publishing a method. If a review says a fixture measured a given PPFD, it should say which meter, at what height, at what point in the footprint, and with what else in the room. Reviews that skip all four are asserting, not measuring — and the assertion is unfalsifiable, which is precisely what makes it worthless.

Our full method, including every formula and every assumption, is on the methodology page.

Picks in this category

Each of these names a top pick and links straight out to it. Prices come from the live price layer, which is why they read “check price” rather than showing a figure we cannot verify at the moment you load the page.