It’s time to replace my ancient 600w MH light with a new LED. A few reasons. Ballast is old, probably will need to be replaced sooner as opposed to later. I want to lower my electric bill. The arcahic light really eats up energy. Also I want to make some room in my 4x4 tent. Between the fan and the hooded light, there no headroom.
So here’s my question.
The old 600w bulb puts out a lot of light. What would be a comparable LED? How many watts?
Looking on eBay there’s some great deals on 200-450w lights. While they promise 4x4 and 5x5 coverage, will they produce the same light intensity as my old MH?
You will want a minimum of 200 watts per plant in flowering.
Be careful about LEDs on both Amazon and eBay. Most of the listing are fraudulent products, despite the reviews you will see. Some of these light sellers are paying customers to fluff up their reviews. To avoid the frauds (they are everywhere,) insist on LEDs built with Samsung LM301 diodes. HLG, Mars Hydro, and Spider Farmer all make decent lights. Avoid lights that output a purple colored light, have integrated fans, and most lights with a daisy chain capability. These cheap lights use too much electricity generating heat instead of light since they are so inefficient.
If budget was my concern I would get a Mars Hydro FC-E6500 , a dimmable 700 watt light.
Will fit in a 4x4 as its 45.75 inches. But you can find brand new ones on ebay for 350 to 400.
If money is not a big issue then an HLG Refurbished Scorpion® Rspec, around 560.00
I’m not saying you are wrong. I am saying there are other ways to think about meeting plants’ needs in most situations. Four plants in a 3x3 seems to be the basis of your argument, and that is in no way representative of the practice of the majority of growers.