ViparSpectra KS5000

The KS Series is ViparSpectra’s foray into the bar light game and they got it right. The KS5000 is a sleek, powerful 4×4 light with a very large footprint that provides strong, even full-cycle coverage. Its 6 light bars each sport 204 Samsung LM301H 3000K/5000K diodes and 6 Osram 660nm reds. Its Sosen driver is rated for 500 watts and is dimmable via a knob on the driver, or through an external controller, and is capable of daisy-chaining additional lights for unified control. It’s hinged in the middle, allowing you to fold it up and move it easily, and takes under 10 minutes to assemble since all the bars are permanently attached to the frame.

ViparSpectra suggests a hang height of 16″ at 100% power for flowering a 4×4 and our results suggest 16″ is indeed your best bet. They recommend a height of 30″ at 50% power for seedlings and 28″ at 75% for veg.

This light is priced right and packs a punch in a 4×4 – it’s our current favourite for new 4×4 lights in 2022.

KS5000 Spectral Distribution
Dimensions:39.4″ x 39.4″ x 1.6″
Driver:Sosen SS-500VP-56BG
Diode Count:1,260 (1,224 Samsung 3000K/5000K LM301H, 36x Osram 660nm red)
Measured Power Draw @30 Minutes Runtime:493 Watts
Recommended Flowering Footprint:4’x4′
Warranty:3 Year Manufacturer

Use discount code GardenerKS on Amazon to save on all ViparSpectra KS Series lights!.

4×4 PPFD Results

- Usable PPF = Average PPFD * Grow Space Surface Area.
- Efficiency    = Usable PPF / Power Draw.
Test HeightUsable PPF (µmols/s)Efficiency (µmols/J)Highest Reading (µmols/m2/s)Lowest Reading (µmols/m2/s)Average PPFD (µmols/m2/s)Uniformity (Min PPFD/Max PPFD)% of Canopy >500 µmols/m2/s% of Canopy >700 µmols/m2/s% of Canopy >1000 µmols/m2/sJump to Chart
6"12802.60133425485919.06%86.0%74.1%39.9%Jump to Chart
8"12512.54116934983929.87%92.4%76.4%24.4%Jump to Chart
10"12192.47105342681840.48%97.9%76.4%7.8%Jump to Chart
12"11852.4097848379549.36%99.6%75.2%0.0%Jump to Chart
14"11612.3692652578056.72%100.0%75.0%0.0%Jump to Chart
16"11392.3188654876561.89%100.0%74.5%0.0%Jump to Chart
18"11142.2685258074868.06%100.0%70.9%0.0%Jump to Chart
20"10912.2182359373272.01%100.0%67.9%0.0%Jump to Chart
22"10722.1779958972073.69%100.0%63.7%0.0%Jump to Chart
24"10502.1377560170577.57%100.0%54.8%0.0%Jump to Chart
26"10352.1075661269580.91%100.0%46.7%0.0%Jump to Chart
28"10102.0573359667881.35%100.0%28.0%0.0%Jump to Chart
30"9992.0371860867184.66%100.0%16.3%0.0%Jump to Chart
32"9791.9969860365786.36%100.0%0.0%0.0%Jump to Chart
34"9621.9568159964587.95%100.0%0.0%0.0%Jump to Chart
36"9491.9266959463788.83%100.0%0.0%0.0%Jump to Chart
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