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Because liberalism is the logical conclusion of intellectual discourse.

If you post the specific models of Mars and Platnium you are considering, we can provide you with more specific information about whether they will achieve your goals.

5 watts is approximately 17 BTUs per hour, and 3 watts is approximately 10 BTUs per hour. A 3 watt light has about 60% of the energy that a 5 watt light has.

An override of the governor's veto seems unlikely as the bill didn't originally pass with a 2/3rds majority.

Vermont Governor vetoes recreational marijuana bill passed by both state legislative bodies.

Can you provide a more detailed description of what you are trying to do?

I believe that the only tool needed is a screw driver. One advantage these boards offer is more useable light per dollar spent vs. an out of the box type of light fixture. There are others.

Should be able to purchase a 135 watt quantum board kit for that price. Put it together, hang, and go.

Hey now, I'm in the process of designing/building a new grow space which will include a 2 ft x 4 ft x 6.5 ft high flower cabinet and two 2 ft x 2 ft x 3.5 veg cabinets. I'll be running 6 quantum boards off a Meanwell HLG-320H-C1400B for the flower space and 1 quantum board for each veg space...

Electricity is 18 to 22 cents per kWh here in western Mass.

Vermont senate has passed the house bill, goes to governor for his decision. First state legislature in the US to vote to approve rec MJ, the other rec legal states became so through ballot initiative.

Check out Growmau5's YouTube channel. He has a series of videos showing the steps needed to assemble a COB LED light that will match or beat HPS at less than 70% of the lighting wattage.

Yes, spray foam comes in either an open cell or closed cell formulation. The open cell is not a vapor barrier, is less expensive, and has a lower R value per inch than the closed cell formulation. The closed cell formulation should be used in applications that are prone to moisture...

Most of the commercial small diode panels aren't really more efficient than HPS. COB LEDs when run at lower power levels provide significant efficiency improvements over HPS or most of the commercial panels. Lots of great info in the LED subforum.

Closed cell foam is a vapor barrier, no other vapor barrier needed.

Sorry, no PM, but see @HydoDan's post from yesterday for some links to appropriate equipment.

If you are willing to spend the time, effort and money, you can get similar or better results from 400 watts of cob LED that you are currently getting with 600 watts of HPS, with less cooling load.

The whole house system ducting system is designed to run most efficiently with all the duct outlets open. If you choke down the duct outlets and try to feed only a couple of rooms, the main AC compressor will be oversized for the load and won't work well. A dedicated system designed around the...

Sorry, saw that you are looking to buy LED lights. The universe of LED lights that are better than HPS that you can buy is not especially large, which is why DIY LEDs are popular.

Because if done right they can be much better than HPS, especially if the OP is willing to DIY.