I emailed SF a while ago about this. The SF1000d is meant as a beginner model. 301d diodes, non Meanwell driver and no dimming option. On the bright side (so to speak) it is only 100 watt light so really not much need for a dimmer. In Canada they are $149 for D model and $220 for regular. To be honest I doubt dimming such a low power light will have much advantage too it anyway. The bigger ones sure. My HLG is vegging plants right now at 50% so 300 actual watts, it would take 3 of these running at full power to match it so I cannot see much use for the dimmer function on this particular light anyway.