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thanks a lot for the video!

That's it, for this comparison it doesn't matter if you spend 500 or 5000 on your growroom, cost is not taken in consideration. I believe LED's are indeed more efficient since you get more lumens for the sam amount of watt's.

I'm only trying to compare the light efficiency not the full grow efficiency. ;)

This is true but consider some people don't even go through Veg time. That is an accurate metric but I'm focusing only on light efficiency for now.

What colour temp do you recommend for LED?

cooling can be an issue with LED? :?

First post in the forum. I’ve been growing for about 16 years mainly outdoor. Started indoor a couple years ago using 1000w’s HPS’s with magnetic ballasts. Later on I switched to 400w Phillips HPS with Lumatek electronic ballasts for efficiency. I’m seeing a lot of discussion and...