400W cabinet converted

hello, this is my first grow,i converted a cabinet to make it a grow room, it is made out of wood, i have a plant that grew up using the sun first then i just finished the cabinet, i changed the lights to 12/12 because i saw it and it was already a female, but i think it is too little to be in 12/12, i only have 1 400w hps light, but it is glowing blue, i tought it was gonna be yellow, and the air i think there is not enough air circulation, i used 2 cpu fans, and i am thinking about putting some aluminum foil for a more reflective box since i cant find any mylar close from home. any toughts and feedback are welcome thank you

Nice setup m8. I'd find something to help reflect the light and get that girl growing!

added aluminium foil as i cant find any mylar close home, i am worried about the humidity, and the box being to hot and cpu fans being too small may i need to add another fan or change direction of it