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While definitely true, the difference between the best HID (DE Gavita, CMH if that counts) and the worse HID is not as big as the difference between shitty epiled and quality cobs from Cree/Bridgelux

SolarStorm 440 draws 320 watt. 2 Solarstorm 440s next to 1 HPS 600 watt (this is excluding the energy the ballast uses) is a fairer comparison. Your 640 watt combined LEDs did 9 ounces, your 1200+ watt HID did 13 ounces. Easy to see which of the 2 performed better. A 600 watt Vero or CXB...

What LEDs are you talking about? There are a lot of manufacturers with different standards and efficiencies. High quality COBs easily outdo HID lighting.

What do you mean with "does not account for time"? Why would a given space produce 4 lbs with LED but 5.5 lbs with HID? What's the wattage in your hypothetical situation? 10 CXB3590 COBs driven at 0.7A (+-500 watt excluding driver) easily outdo any 500 watt (excluding ballast) HPS fixture.

You're not seriously thinking HPS is the same as incandescent are you? That's the only reason I can think of why you think those numbers are wrong. HPS is more efficient than CFL, that's a fact. It's not a difference of opinions, you're simply ignorant.

If you don't have time to do fucking research don't give fucking bullshit claims. You only have to look at the lumen/watt to come to the conclusion that HPS is much more efficient than CFL. HPS has up to 150 lm/w, CFL only 70 lm/w or so. Kill yourself you imbecile.

You couldn't be more wrong, CFL is much less efficient than HPS. The reason they don't use HPS in household lighting is because the Colour rendering index of HPS is around 25, it's much too yellow. CFL is at most around 12% efficient while HPS is 20+% efficient If you seriously think CFL is...

The thread title is : "300 watt CFL yay or nay" So I gave the answer that it's much less efficient than HID which implies a "nay" And if you're willing to spend money on a 300 watt CFL a budget 250 watt HPS set is the same price which is also roughly the same price as 2 "300watt" marshydro led...

Nah, it's efficiency or rather lack of efficiency that's the big downside to CFL. HID and LED are both much more efficient

You should double that. 2 plants is prob at least 4 square foot. You should aim for +-65 watt per square foot with CFL if you want decent flowering.

I don't think CFLs provide any advantages any more. If you look good/lucky sales you can find more efficient led bulbs for the same price or even lower.

CFL is less efficient than HPS or LED. It would worsen heat or lower yield while heat issues still remain the same. The only possible way to remove heat issues is either better ventilation or less wattage lights.

There are also 110 and 230 VAC axial fans incase a power supply is too much bother. Example

How do you guys deal with Sciaridae? (Fungus Gnat)

450 dollars is fair enough for those panels. It will certainly grow good in a 4x4 tent

Every day a new man asking the same question about is x good, how is y. Always the same. A lot of people are tired.

(Normally) overpriced for what you get but it works. How much did you pay for it?

I shaked the stems of my peppers to pollinate them

3 CXB3590s 36v at 1.4A? Would handle it passively easily.

Fish do need a dark period or they die just like sleep deprived humans. If there's enough cover in the aquarium/habitat that covers them well from light then that will work too but they can't handle 24/7 light.