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Hi
I use a Kendrick Digifire 7 and am very happy with it, you can adjust the output from 10 to 100% depending on aperture and ambient temperature and there are 4 variable outputs plus a dedicated 12v output. I would be very cautious about using hair driers or equivalent as the heating elements attract dust and when you switch on there is a risk that you then blow dust all over your valuable optics (not a good idea), if you are going to use a hair drier and I have in the past aim it at the side of the telescope close to where the objective lens is and at an angle pointing towards where the light comes into the telescope, that way you won't risk blowing directly at the lens
Best wishes
Gordon
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