I am trying to work out the actual output of Neopixels compared to Traditional lighting for a fish tank.

So i know for example that a fish tank requires ~1 watt per gallon of water. Different set up need different amounts but this is a good average number.

This is based on fluorescent lamps so my current tank has 80 Watt tubes which make sense.

But I would like to switch to LED's but finding a lot of conflicting information.

I was looking at a strip of nano pixels

5m 16.4FT 150led WS2812B Full Color LED strip 150 LED 150 pixels, which has the following specs

Size: L500cm (5M) x W1.2cm x T0.45cm

Emit Color: Programming control

Protection: IP20 non Waterproof

Working Voltage: 5V DC

LED Quantity: 30eds / m, 5meter / roll

View angle: 120 ° ~ 140 °

Working Temperature: -20 ° to 50 °

350-450mcd/led

Wattage: max 7.5W/meter,

Color Temperature: 3500-7500K

So this suggest is is going to pull 7.5 X 5 = 37.5watts in total or ~7 amps

but 350-450mcd per LED X 150 only = 250 Lumen which seems very low!

And then i read things like this on some Aquarium sites

"

When it comes to lighting your tank, size matters. Most fish tanks need 1 to 3 watts per gallon of water, while those with plants need 2 to 5 watts per gallon. LEDs work differently than traditional lighting options because they're more energy efficient. They often come in 1- and 3-watt options; the more LEDs you use, the higher the overall wattage they produce. For a small tank, 18 1-watt LEDs on a 12-inch heatsink fixture should equate to 175 watts. If there are 24 LEDs on the same fixture, you have 250 watts of light, and 36 LEDs gives you 400 watts. The same number of LEDS on a larger fixture lowers the wattage; for example, 36 LEDs on an 18-inch heatsink bar is equivalent to 250 watts. When purchasing LEDs, read the manufacturer's specifications to determine how many watts the fixture provides.

"

which seems to say 18 X 1Watt LED = 175 Watt?

So how do i make sence of all of this?its a bit like a 7W LED bulb = 40W incandescent.

What is the real number i should be focusing on (lumens?) and what numbers do i need to accurately calculate it from the Specs of the LED's?