Since I needed some better lighting myself I decided to do a little testing. Here's what I did.
I bought an OTT lamp, desk model such as this. (Paid $50 at Canadian Tire.)
Then I went to Rona and bought the following lamp ($13.77) and stuck a 18 watt Tensor Vision Max bulb ($14.98) that I also bought from Rona into it. The Tensor Vision Max bulbs are a natural daylight bulb that put out equivalent amount of light as a 75watt incandescent bulb. (Sorry no link to the bulbs.)
http://www.rona.ca/webapp/wcs/stores/servl...productId=50311
I then put the lamps to the test by sitting down and tying for a few hours. I used the OTT lamp first then the Rona configuration. I found the OTT lamp was in my way and did not produce anywhere near the required amount of light. The Rona configuration lit up my entire tying area, plus it can be moved easily. The color temperature of the lamps was identical, or at least I didn’t notice the difference. In other words they produced light that looked the same. I found my eyes did not get tired or strained using either lamp.
Conclusion:
The OTT lamps are very, very, very pricey, even when on sale. I’m sorry I ever posted a link to them. The Tensor Vision Max bulbs produce way more light for less than a third of the cost. Furthermore it looks like Tensor makes almost the identical lamp as Ott for quite a bit less:
http://www.acehardware.com/product/index.j...oductId=2422240
http://www.target.com/gp/detail.html/601-6...gt_adv_XSP10001
$49.00 for a light bulb?
http://www.ott-lite.com/productdetail.asp?product_id=40