These are the things in my hood

In the first place, please don't mind the photo shows a bit underexpose, because used high shutter speed to take photo, it will cause the lights look a bit dim, and also the old rusty metal clip & messy hood. This is a custome made aquarium hood that fits in 3nos. 32W NEC 8000K circular light, 2nos. 22W Philips 6500K circular light, and 2nos. 9W red PL-C tube light(bought it wrong, suppose need blue colour instead of red). For the reflector part is using the aluminium foil that normally use in microwave oven.

Some explaination of what is the K, Color temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, and other fields. The color temperature of a light source is determined by comparing its chromaticity with that of an ideal black-body radiator. The temperature (usually measured in kelvin (K)) at which the heated black-body radiator matches the color of the light source is that source's color temperature; for a black body source, it is directly related to Planck's law. Yellow-red colors are considered warm, and blue-green colors are considered cool. Confusingly, higher Kelvin temperatures (3600–5500 K) are considered cool and lower color temperatures (2700–3000 K) are considered warm. Cool light produces higher contrast and is considered better for visual tasks. Warm light is preferred for living spaces because it is considered more flattering to skin tones and clothing. Color temperatures in the 2700–3600 K range is recommended for most general indoor and task lighting.

From the photo above can compare between the 8000K & 6500K colour temperature of the lights, the lower the K value means the more yellow or warm in the flourescent tube. 6500K is the good colour temperature for a healthy plant to grow and almost like the outdoor(places near to Equator, such like South America, Africa and Asia), and when reach to 8000K is almost like in the middle of the mountain, some people using over 10000K of tube lights, the brightness is like standing on top of the mountain looking out from their eyes.