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Checking Jack's. That's gonna come in handy when I start doing sunlight hydro!

I think that's the answer depending on how readily available that replacement sensor will be. I don't want to buy a $100 meter if it's going to fail in the same way $15 meters do.

I'll allow it. I'm tired of hearing that GH = MiracleGro = Monsanto when the connection is so tenuous.

They are similar enough that I have my suspicions about the product being a re-branding of the same material.

If they're all bad, I'm thinking to go for the $15 Vivosun :-/ My Bluelab experience wasn't great, and I don't understand why they get so much love. Give me ten $15 meters on a repeat order and they'll last longer than my $150 pen did. I'm tempted to go back to dip strips to be honest. I think...

Has anyone tried the Lucas Formula using Holland Secret Micro+Bloom?

It's weird to read these threads and get a sense that people's problem is not enough heat. I have to make a grow tent work through an Arizona summer, when a stretch of cool days will be 110°F. So at best, with the AC at full tilt, chilly houses might be in the high 70s. I had to give up...

I had great success with it, but it's been years since my last grow. As I'm preparing to get back into it, my only thought is to use the Lucas method. I wonder why it doesn't seem very popular on the forums. What's not to love? It's hippie proof and works perfectly well. I added stuff for...

Why have you ruled out Mars TSL2000?

I stopped growing a while back for a bunch of reasons, but I do want to thank RIU for all the help. Anyway I'm going to have a place to start growing again and I plan to. I see that LEDs have arrived -- they really weren't quite there at the time, and of course I used HIDs. My biggest problem...