Spider Farmer and Mars Hydro are two of the most popular LED grow light brands for home cannabis growers, and on paper they are close rivals. Both sell board style lights for beginners and bar style fixtures for larger tents, both offer dimming, and both price below premium brands. Spider Farmer stands out on paper for its G series with app control and high listed efficiency, while Mars Hydro offers a wide range across its TS boards and FC bar fixtures. The better choice depends on your tent size, whether you want bars or boards, and which features matter most. Whichever you choose, start with good genetics from our indoor seeds. This guide is for adults 21 and older growing where home cultivation is legal.

This is a spec based review. It draws on each maker’s published specs and common grower feedback. We did not run our own test grow, and Kind Seed Co is not affiliated with Spider Farmer or Mars Hydro. Always check current specs, because both brands update models often.

Quick comparison

Feature	Spider Farmer	Mars Hydro
Board lights	SF series	TS series
Bar lights	SE series, G series	FC and FC E series
App control	G series, per maker	Check model
Diodes	Varies by model and version	Varies by model and version
Background	Reported Shenzhen based, founded around 2009	Reported Shenzhen based, founded around 2009

The two are separate companies, though they are often compared because their product lines and target buyers overlap.

Spider Farmer on paper

Spider Farmer’s best known lights are the SF boards. According to the maker, the SF2000 draws 200 W with a listed efficiency of 2.7 micromoles per joule, and the SF4000 draws 450 W at the same listed efficiency. Diode type has changed over time. Current SF2000 listings mention Bridgelux diodes, while older versions used Samsung LM301B. If diode brand matters to you, check the exact version.

The G series is Spider Farmer’s newer bar line. The maker lists the G4500 at 320 W and the G5000 at 480 W, both at 2.85 micromoles per joule, with app control on supported models. The SE series offers more bar options.

Spider Farmer strengths

• Clear board lineup for common tent sizes.
• High listed efficiency on the G series.
• App control on some newer models.

Spider Farmer trade offs

• Version changes. Diodes and specs differ between production runs.
• Bar fixtures cost more than the basic boards.

Mars Hydro on paper

Mars Hydro’s TS series are board style lights aimed at beginners, and the TSW line offers wider boards. The FC series are bar fixtures. According to the maker, the FC line uses Samsung LM301H EVO diodes. The FC E line is a lower cost bar option. Sources disagree on which diodes the FC E uses, so check the spec sheet.

Mars Hydro strengths

• Wide range from small boards to large bars.
• Bar fixtures with named premium diodes on the FC line.
• Popular with beginners, so setup guides and community tips are easy to find.

Mars Hydro trade offs

• Many similar model names can be confusing.
• Specs vary by line. Compare the TS, TSW, FC and FC E carefully.

Boards vs bars from both brands

Both brands offer the same basic choice. Boards are compact and simple, good for small tents and first grows. Bars spread light more evenly and release heat more easily, which helps in 4×4 and larger tents. Read quantum board vs bar LED for the details and grow light bar spacing if you go with bars.

Diodes are not the whole story

Many buyers compare these brands by diode name. That is a starting point, not the full picture. The same diode can perform differently depending on how many are used, how hard they are driven, the driver quality and how well the fixture sheds heat. Diode bins also vary. Read grow light diode binning and grow light lumen maintenance to understand why.

The most useful numbers to compare are listed power draw, listed efficiency and listed coverage for the size you need. Then check the warranty and support.

Which brand fits your grow?

Your situation	Lean toward	Why
First grow in a 2×2 or 2×4	Either brand’s entry board	Both offer simple, dimmable boards
3×3 tent	Either brand’s mid board	Compare coverage and height
4×4 tent, want even light	A bar fixture from either brand	Bars spread light better
Want app control	Spider Farmer G series	Listed app control
Want named premium diodes on bars	Mars Hydro FC	Listed LM301H EVO

Setup tips for either brand

1. Hang at the maker’s suggested height for your stage.
2. Dim for seedlings. See cannabis seedling light schedule.
3. Raise intensity gradually in flower. See when to increase light intensity in flowering.
4. Keep a flat canopy. Training helps every plant get its share. Read training techniques for marijuana plants.
5. Watch for bleaching and heat. See light bleaching cannabis and grow light heat management.
6. Measure your light. A PPFD map shows hot and dim spots.

How to compare two spec sheets

When you have one model from each brand in mind, line them up the same way. Start with actual power draw at the wall, not the model name, since a model number often does not match wattage. Next, compare listed efficiency, which tells you how much light each fixture claims to make per watt. Then look at the listed flowering coverage and the hanging height that coverage assumes. A light that covers 4×4 only when hung very high may not fit a short tent.

After that, check the practical details. Is the driver detachable, so you can move heat outside the tent? Does the light dim, and can it link to a controller or other lights? How heavy is it, and will your tent frame hold it? Finally, read the warranty terms and recent support reviews. Two lights that look the same on paper can feel very different after a year if one has better support.

Warranty and support

Both brands sell widely through online stores, and both list multi year warranties on many models. Terms vary by product and seller, so read the warranty page for the exact model before buying, and keep your receipt. Support quality is a common deciding factor in grower reviews, so check recent feedback in your region.

Running cost and heat

Running cost depends on watts and hours, not brand. A 200 W light running 12 hours per day costs the same whoever made it. Higher efficiency only saves money if you use the extra efficiency to run at a lower wattage for the same light. Read grow light electricity cost to work out your own numbers.

Our take

On paper, Spider Farmer and Mars Hydro are close. Neither is a clear winner for every grower. Pick the brand whose specific model fits your tent size, layout and feature wants best. If you need help choosing a light type first, read choose the right LED lights for your cannabis grow.

Frequently asked questions

Is Spider Farmer better than Mars Hydro?

Neither is better for every grower. Compare the specific models for your tent size, efficiency, coverage and warranty.

Are Spider Farmer and Mars Hydro the same company?

No. They are separate companies, though both are reported to be based in Shenzhen.

Which uses Samsung diodes?

It depends on the model and version. Mars Hydro lists Samsung LM301H EVO on the FC line. Some older Spider Farmer boards used Samsung LM301B, while newer SF2000 versions list Bridgelux.

Which is better for a 4×4 tent?

A bar fixture from either brand usually gives more even light in a 4×4.

Light up your grow

The right light is the one that fits your space and plans. Choose genetics to match from our indoor seeds or browse the full Kind Seed Co shop. Kind Seed Co sells only to adults 21 and older. Always follow the home grow laws where you live.