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Hi, Fiddling with electronics/micro-controllers is a hobby of mine and I'm thinking of building my own Led growlight. I (basically) know why different colours are used, I know about narrow bandwidths of LEDs and why it's best to use different colours red and blue. Since I use cfl now and only...

Hi, Two questions. One thing I wonder is how... to check the outcome of a humidity sensor ? I could hold one in a freezer (0%) or damped box (90% +), but how can I actually check when a sensor displays 50% air-humidity from a sensor it also agrees with reality ? Calibrating a PH-sensor is...

Few new members lately or have digital spider mites been ruining the last crop :mrgreen: ? (sorry, couldn't resist...) Anyway, I'm long term user, newbie to this forum and I'm from the Netherlands. Have been growing cannabis for about 24 years, but mostly guerilla and in my back garden. (not...