A grow light of 300 W or more lights a 3x3 to 5x5 ft tent of full size vegetables such as tomatoes, peppers and cucumbers. At this size the difference in efficacy shows on the power bill, since a light often runs 12 to 18 hours a day, and bar lights usually spread light more evenly to the corners of a tent than a single panel. Check the weight against what your tent frame can hold.
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Full ranking 13
- Mars Hydro FC-E3000#1 of 13Full review
A good value, water resistant bar light for a 3x3 ft tent of fruiting vegetables.
Amazon $169.99$169.99300 W840 µmol/s2.8 µmol/J - Mars Hydro FC-E4800#2 of 13Full review
A water resistant bar light for a 4x4 ft tent of tomatoes, peppers or cucumbers, at a lower price than most lights its size.
Amazon $289.99$289.99480 W1,344 µmol/s2.8 µmol/J - Spider Farmer G4500#3 of 13Full review
A good value bar light for a 2x4 ft tent of vegetables, with app control and far red included.
Amazon $189.99$189.99320 W913 µmol/s2.9 µmol/J - Spider Farmer G5000#4 of 13Full review
A strong value bar light for a 3x3 to 4x4 ft tent of fruiting vegetables, with the same published output as the pricier SE5000.
Amazon $299.99$299.99480 W1,420 µmol/s2.9 µmol/J - Spider Farmer SE5000#5 of 13Full review
A high efficiency bar light for a 3x3 to 4x4 ft tent of tomatoes, peppers or cucumbers. Worth it if electricity costs matter to you.
Amazon $339.99$339.99480 W1,420 µmol/s2.9 µmol/J - Spider Farmer SE3000#6 of 13Full review
A dense, efficient bar light for a 3x3 ft tent of tomatoes, peppers or other fruiting plants. App control comes included.
Amazon $199.99$199.99300 W856 µmol/s2.9 µmol/J - Mars Hydro FC3000#7 of 13Full review
An efficient bar light for a 3x3 ft tent of tomatoes or peppers.
Amazon $199.99$199.99300 W855 µmol/s2.9 µmol/J - Spider Farmer SE4500#8 of 13Full review
An efficient bar light for a 2x4 ft tent or a long bench of vegetables, with app control included.
Amazon $219.99$219.99320 W913 µmol/s2.9 µmol/J - Spider Farmer SF4000#9 of 13Full review
A single panel that lights a 4x4 ft tent of full size vegetables. It suits growers who want one simple fixture; bar lights are more efficient.
Amazon $259.99$259.99450 W1,141 µmol/s2.7 µmol/J - Mars Hydro TS3000#10 of 13Full review
A single panel for a 4x4 ft tent of tomatoes or peppers. Choose it if you prefer one simple board; bar lights are more efficient.
Amazon $269.99$269.99420 W1,151 µmol/s2.7 µmol/J - Mars Hydro TSL2000#11 of 13Full review
A long, narrow panel for a rack of seedlings or a row of herbs and greens. A good shape for shelves where square panels waste light.
Amazon $169.99$169.99300 W778 µmol/s2.6 µmol/J - Mars Hydro TSW2000#12 of 13Full review
A mid size panel for a 3x3 ft tent of vegetables or a 4x4 ft tent of seedlings. Buy it direct for the lower price.
Amazon $199.99 Mars Hydro $169.99$169.99300 W776 µmol/s2.6 µmol/J - HLG 600 Rspec#13 of 13Full review
A powerful, US designed panel for a 4x4 ft or larger tent. It costs far more for the same light than the bar lights here.
Amazon $559.95$559.95600 W1,529 µmol/s2.6 µmol/J