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10-13-2009, 07:41 PM #11
Senior Member
New Induction Grow light
Hey knna,
Here's the link to them: Shanghai M_land Industrial Corp.,Ltd Take notice of the LEDs, much of what you see on e-bay and from bs marketers of crap LEDs originate here.
Hello bigdutchmen,
I hope I'm wrong about those lights for your sake, so I look forward to your getting them, trying them and then reporting back to us. I looked at induction lights abt 15 years ago and to me there were just fancy fluorecents that had large (at that time) ballasts that could not be remotely mounted, I passed on them then.
As to spectrums provided by chinese companies, I need to pass this on to everybody. When I was building my first hi-powered LED light I had purchased 250 Red 2w Cree's 635nm since I knew them to work well (660nm red was not available) and to combine them with white LEDs. I had done alot of research on LEDs at the time and noticed most whites were driven by a blue die that excited the phosphor. The spectrum output was a blue spike at about 460nm and then a larger sweep covering the spectrums up to reds. I decided to cheapen up the design by using white diodes fron China. I had contacted a couple of mfgs with what I was looking for and one company, from Shanghai, sent me back a quote and included a spectrum analysis of the LEDs and it was exactly what I was looking for. I purchased 100 1w diodes and built my light. First run trying the light was a complete f-up, plants stretched so much they hit the glass enclosure (only have 24" clearence) of the light. I immediately realized I was lacking blue big time. I wound up sending a couple of the white diodes to someone for spectrum analysis and the resulting graph was no where near what was originally sent to me. They completely lacked any usable blue. I wound up rebuilding the light but used T5s full spectrum fluros instead of the LEDs. A couple of weeks later while going thru LED specs again I came across the EXACT spectrum I had been sent, it was on the Luxeum site. The bastards had copied it, put thier name and chinese characters on it and called it thiers. I've had a grudge against chinese crap since then.
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