hygger 957 LED Aquarium Light, 36"-42", dimmable, full spectrum

Set the built-in timer and this 36-inch LED fixture switches on and off by itself over a 24-hour cycle. The adjustable legs rest on tanks between 36 and 42 inches wide, and a low voltage DC adapter powers the light. Output is 2879 lumens at 6500-10000K.

The LED mix, the timer and the night setting

Five things shape how this fixture is set up: the LED mix, the timer, the dimming, the moonlight mode and the DIY cycle. Each is described below with its own numbers.

• The white daylight mode blends white, red, green and blue LEDs; the 36-inch fixture holds 99 white LEDs at 6500K, 17 blue at 450-455nm, 9 red at 620-625nm, 8 green at 520-525nm and 45 RGB LEDs.
• A built-in timer switches the light on and off automatically, and a memory function keeps the settings after the power is cut.
• Intensity and colour can be adjusted, and the moonlight mode offers six single colours (red, purple, blue, cyan, green, yellow) at ten dimmable levels.
• A colour gradient loop runs through the day's colours, and daytime to nighttime schedules can be fine-tuned.
• DIY mode splits a 24-hour cycle into eight time slots, each with its own on and off times and light intensity.

The 24-hour cycle can be set to follow dawn, midday, afternoon and night, with the light coming on and going off by itself. The fixture has no fan, and the fully encased 1.2 mm aluminum shell carries an IP68 water-resistant rating.

Measuring your tank before you buy

The legs of this light extend over aquariums with a width between 36 and 42 inches, so a tank narrower than 36 inches or wider than 42 inches is outside the stated range. Check the outside width of the tank's rim where the legs will rest, not the volume in litres or gallons.

The fixture itself measures 34.2 in long, 3.9 in wide and 0.9 in high (86.9 x 10 x 2.2 cm), and it weighs 1.52 kg (3.35 lb). The adapter is a low voltage DC unit, and the light is rated for freshwater use.

What comes in the box?

The pack holds the light body of the 36-inch fixture and its power supply. Mounting is done with the adjustable legs that are part of the fixture.

• Light body, 36 inches long
• Power supply with low voltage DC adapter

Setting the schedule

A 24-hour schedule can be laid out across dawn, midday, afternoon and night, and the timer takes over the on and off switching once it is set. The daytime to nighttime schedule can then be fine-tuned, and the colour gradient loop can be left to move through the day's colours.

For a custom cycle, DIY mode provides eight time slots across 24 hours, and each slot gets its own on time, off time and light intensity. Intensity and colour are adjustable outside DIY mode as well, and the moonlight mode can be set to one of six colours at any of ten dimmable levels.

Questions about the hygger 957

How wide a tank does this light fit?

The adjustable legs are made for aquariums between 36 and 42 inches wide.

Does the light turn itself on and off?

Yes, a built-in timer handles the automatic on and off, and a memory function keeps the schedule after a power cut.

How many LEDs are in the 36-inch fixture?

It holds 99 white at 6500K, 17 blue at 450-455nm, 9 red at 620-625nm, 8 green at 520-525nm and 45 RGB LEDs.

What colours does the moonlight mode offer?

Six single colours are available: red, purple, blue, cyan, green and yellow, each at ten dimmable levels.

What is included with the light?

The box contains the light body and the power supply.

Does the fixture have a fan?

No, the fixture runs without a fan, and the 1.2 mm aluminum shell is fully encased with an IP68 water-resistant rating.