2Dream--that looks GREAT. I use a towel to control mine, also, in my larger, wooden brooder. Works great, and provides a lot of control on heat/cool.
And as I am sure you know, as the chicks get some feathers & you need to lower the heat, just use a lower bulb. 60, 40, etc. Good luck.
Oh, one thing, if the brooder is where it doesn't get too cold, it isn't as dangerous, but if it is really cold, you want to be alert to the bulb burning out at night, and them getting chilled. I am old and have to hit the bathroom 3 or 4 times a night (lol--too much info, I know) so I always check my bulbs in my 3 brooders when I am up, and have found them burned out sometimes, with chicks huddled and chirping quietly and anxiously. But since it is heated by a wood stove in our garage, they weren't hurt. Good Luck.