We will not be able to compare. We are not going to be stocking the HD33, but what you stated above along with the black case is all anybody could tell the difference between the two. You would have to use measuring equipment to tell the lumen and contrast difference. To me the biggest difference is the warranty. Since the HD33 is not going to be discounted very much the price difference is not as big as it seems. Place an extended warranty on the HD33 and the lamp and you might be surprised at the result.