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Welthink had been sold on June 2018, no matter what happened in this forums, it's all gone. New boss and me will attend CWCB Expo at the Jacob K. Javits Convention Center, New York. Booth No.448 I mainly in charge of grow light developing, will bring 2400umol/s 1000w DE HPS, 680umol/s 315w...

Customers demand more UV in 315w CMH for Cannabis grow, so we have developed a new one. Left is the one most companies selling on alibaba.com, right one is our new developed. I test with OHSP-350P, a new handheld tool. I set the light 50cm away from sensor, sorry for my messy...

I have collected some useful data to check the differences between cheap one and real one, see attached

Hi everyone, read the attached files first. Currently there are many distributors purchased fake 1000w double ended from China, the arc tube inside it just for street lighting not for plants growth. Only real one measured by PAR, ask them how much PAR of the bulbs before you buy. As Philips...