The X series from Nova are quality lasers. Its fact around here that they are. When you purchase one, you are basically promised to get that output measurment or HIGHER. In fact, most people receive items in which their averages are +10 mw's higher than the advertised value. Novas lasers also come with quality IR filters. They leak minimal IR which helps A LOT.
The DX lasers are chap for a reason. For one, if i remember correctly, the DX 200 laser isnt a "True" laser. The divergence probably sucks on it. Not to mention their IR filters are crap at best and leak a ton of possibly harmful infrared rays that can harm your vision. The DX lasers include the IR in their output.
In other words, they advertise their 200mW in green light and IR light. So basically, you may be getting 100 mW's of green light and 100mw's of IR light. You cant see IR, so you only get the visual effects of just the green light
Basically-that 200mW is probably dangerous. The output powers you will get will likely be close as Nova is usually over powered while DX is usually underpowered. In the long run your nova will likely last onger and be healthier to be around.
Which ever you chose, though. Remember that you get what you pay for. If it looks to good to be true (IE a 200mW laser that has good divergence, good beam diameter, a solid build and safety features like a quality IR filter) than it likely isnt all it is cracked up to be.
