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I need to replace my 400W bulb, it's a standard 2700K GE bulb. There are two 400W bulbs I'm considering, but don't know the difference: 1. Philips SON-T PIA AGRO: This one has "Agro" (means grow-light?) in the name, it claims to have 30% increase in blue light (=less red). 2. Philips SON-T...

I've always used MH during veg, and regular HPS (2700K) during flowering with good results. However, my HPS bulb need replacing, and the my local growshop now have HPS-bulbs with 30% more blue light. They cost a little more. Are they worth it?

I'm trying to harvest an Indica plant (N.L.) at the correct time, I want a couchlock/narcotic high that can put me to sleep. I'm starting to believe that harvesting at peak THC (cloudy) is what will give the best effect, and that this will give couch-lock effect if it's an Indica. So no need...

Because of the very cold & dry weather, I fill buckets with HOT water from the tap, and put in my grow room. This will increase RH nicely, but I'm wondering.... does the chlorine harm the plants as the water evaporates from the buckets?