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Panda grow - cfgrow, canagrow on amazon. IMO these are great commercial cree cob lights for those looking for something cheap but powerful. Not that energy efficient, but they do the job. More COBs at less power would be better. They have a dimmer so you can make that happen, and crank up as...

Lux isn't going to help you at all. You need a PAR meter, and they are very expensive. PAR meters measure PHOTOSYNTHETIC ACTIVE RADIATION, or the light that your plants can use. Some of this light is hardly, or not visible to the human eye. It's why your cob looks white/orange when it is really...