The bulb you have is dark red and give a deep red glow if I am getting what you mean. The only issue with this type of bulb is it isn't as efficient as a IR only bulb ( some energy is given to produce visible light as we understand it that is a by product, all lights produce varying amounts of IR) that as far as humans can see has no light there are usually made from ceramic (ceramic heat emitter or CHE) CHE give of true IR that a ball P can 'see' with the heat pits (the heat pits are connected to the optical centre of the brain so it is also processed as vision) The red bulb is full IR but also near ir we humans can see near IR but not full or true ir. The ball python see both so there is no difference to the snake.