I have the 4" Osram chip that you are speaking about and these are of 10W and consume 1.8A current (Set of 2). But don't be fooled by the numbers, these are very very bright. I'm using 60W*2 led on my car and it's way better than Hella auxiliary lights (I hated Hella and sold those after getting the OSRAM lights). These 60W led's put my 55W HID (with high end ballast) to shame. Have posted a pic of tese some posts back but since the post, I have refocused them and I am now utilising the full power of these lights. People have opened these light bars and have verified that these are not original OSRAM LED chips but normal LED's that are made to run at 1.5W. But their light out put is very high, specially those of 10 degree spot lights. I have attached a link which shows Phillips LED bar having normal 3030 1W chips. Same is the case with OSRAM. I have been using them for more than a year and never gave me a problem. However, for the price I paid, these are the best ones than CREE and Hella auxiliary lights, be it for bike or for car. Another advantage is, these consume very less Amperage and are very good on batteries.
Some pics of 30W testing. These are ready to be installed on D390, may be after few weeks.
Video link



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