Hey guys still new to this lol i bought a HLG300L few weeks back and the control nob has no numbers ect to adjust. Im in the veg stage still and wondering if anyone knows what intensity it should be at throughout the grow process? The manual doesnt help and my plants seem to be lagging a little. Any ideas?
How many square feet are you covering, how many plants? I personally use a âKill-a-Wattâ meter to set my lights.
I run a similar DIY light and run in veg at around 50% power (150 watts) in veg at around 20" above plants.
4 Likes
Its a 4Ă4 tent 4 plants 260w im new to all this so im learning lol. I had some leaf currling so i raised the light and it seemed to help but i have the intensity all the way up and im not sure if there getting to much light. Im at 24" above the plants now.so 50% at veg and what do you run it at during flower?
I run my lights at peak around 210 watts. Thatâs per plant. Height is 18" or so. Plants need less light intensity during veg due to the longer day to night cycle. Once in flower (12/12) the light intensity will peak as you are on a shorter day trying to make the same DLI.
Here is a chart:
1 Like
Ahhhh i see. Maybe i should have mentioned im growing autos right now. My cycle is 18/6 i just wasnt sure about the correct intensity for each stage.
Autos seem to require somewhat less intensity. That said you can run your lights to achieve optimal DLI using height, power and duration.
Hereâs a DLI chart
I use the VPD keeping the 1.2 thru 1.5 range and 50%RH.
Saturday is tent clean/water bath night. I will move lights and android DLI map the tent.
1000 watts (Metered, not âADVERTISEDâ) PPFD/DLI maps around 800/40 respectively, at max.
1 Like
You donât have enough light. Your 300L is specâd at 250w max draw dimmer turned all the way up. A Kill-A-Watt would give you the voltage, watts, amps and other info. A very useful tool. But only half the info needed. HLG even says max flower tent size is 3x3 and even thatâs a bit to big at 27.7 watts per square foot for that light. Photo or Auto does not matter. Basic math tells us you have 15.6 watts per square foot. Thatâs half of what the min. recommendation is now days of 30 watts per square foot in your 4x4. And as LEDâs get better and better and people start learning how to use them the min. number has been quietly raised to 40 watts per square foot. The number of plants or canopy size only truly becomes a issue when you have met or exceeded the watts per square foot and your goal then becomes how evenly you can light the square foot area. Light drops off the closer you get measuring ppfd to the walls and corners. You really need another 300L and even that will only give you 27.7 watts per square foot or so. The only way your going to be able to get your light to work for you as it should is to partition out your tent and move your grow to half the tent and use it as a 2x4. In a 2x4 you will have around 31 watts per square foot. Good Luck!
Awesome thanks for the info 
i have 2 other spider farms but i wasnt sure if i can mix the 2 different lights together. Both a 1000w but only 100 true watts
Great thanks! This chart will come in handy. By the looks of the chart m running at 90% ugh to high!
