Lumatek - Zeus 300W Pro 3.1 LED

The Zeus 300W Pro 3.1 delivers 965 µmol/s at an efficiency of 3.1 µmol/J and is drawn around a long 120 × 60 cm growing area.

Here the model number actually means something

With most brands the figure after the model name is marketing. A lamp called 1000 draws a hundred watts, a 2000 draws two hundred, and the number climbs faster than the power does. With Lumatek the 3.1 in the name is not invented: it is this range's stated efficiency, 3.1 micromoles per joule.

That is precisely the number lamps ought to be compared on. Micromoles per joule tells you how much usable light comes back for every joule you put in, and it is the only figure that sets two lamps of different brands and different wattages fairly beside each other. Watts tell you what you pay, µmol/s tells you how much light you get, and µmol/J tells you how well the lamp connects the two.

Two cautions with it. A manufacturer who puts the number in the name wants you to look at it, which is fair enough here because 3.1 is high. But always check whether it describes the complete fixture rather than a single diode, because that difference is large and common in this trade. And do the sum yourself: divide the quoted µmol/s by the wattage and see whether you land nearby.

Technical Specifications:

• Model: LUMLED028
• Power: 300 W nominal, around 312 W actual draw
• Light output: 965 µmol/s PPF
• Efficiency: 3.1 µmol/J, for the complete fixture
• Suited to: 120 × 60 cm
• Current: around 1.4 A at 230 V
• Cooling: passive, without a fan
• Weight: 7 kg

Frequently asked questions

Does the 3.1 in the name refer to efficiency?
It does. It is this range's stated 3.1 µmol/J, not a wattage or a sequence number.

Is that 3.1 for the whole lamp or for one diode?
For the complete fixture. That is an important distinction, because some brands publish only the figure for a single diode.

Why does it say 300 watts and also 312 watts?
300 is the number in the name, 312 is what the lamp actually draws. The efficiency is based on that actual draw.

Will it suit a square tent?
It is drawn around a long field. In a square space two edges fall behind.

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