The G-Bars 170 spreads its 170 watts across four separate LED bars on an open frame. We rate it for a 60 x 60 cm tent or cabinet. Because the bars sit apart and throw light at 120 degrees, you can hang them close to the canopy without scorching tender leaves. That cuts wasted light and feeds tomatoes, chillies and leafy salads evenly.
A four-position dimmer comes in the box, so you can drop the output for seedlings and ramp it up as plants mature. Passive cooling means no fan noise. PPF reaches 416 micromol per second, with 940 micromol measured 20 cm under the bars.