Maxspect Jump MJ-L230R | LED Refugium Light Fixture for Saltwater Macroalgae Growth

The Maxspect Jump MJ-L230R is a compact, dedicated refugium LED light fixture engineered to drive vigorous macroalgae growth in your sump or display refugium. Combining a 6500K daylight white channel with a deep red horticultural channel, the MJ-L230R delivers the exact photosynthetic spectrum that Chaetomorpha and other macroalgae need to outcompete nuisance algae and export nitrate and phosphate from your reef. Browse more saltwater equipment.

Why a Dedicated Refugium Light

• Targeted spectrum — 6500K white + horticultural red maximizes Chaeto growth rate and density.
• Natural nutrient export — growing macroalgae pulls nitrate and phosphate out of your reef without chemicals.
• Compact form — gooseneck mount fits over most sump refugium chambers without taking up display real estate.
• Low energy, low heat — LED efficiency keeps the sump cool and your power bill down.
• Built tough — aluminum heat sink and IP-rated construction stand up to the humid sump environment.

Setup & Use

• Mounting — flexible gooseneck arm clamps to the rim of most sumps and display refugiums; adjust height and angle to suit chamber depth.
• Photoperiod — run on a reverse cycle from your display lights (8–12 hours during your tank's "night") to stabilize pH around the clock.
• Distance — mount 4–8″ above the macroalgae for best growth without bleaching.
• Maintenance — harvest a third to half of the Chaeto every 1–2 weeks to keep nutrient export at peak efficiency.

Specifications

Recommended Pairings

• Chaetomorpha Macro Algae — the classic refugium algae for nutrient export.
• Brightwell ChaetoGrō (250 mL) or 500 mL — trace-element supplement formulated specifically for Chaeto growth.
• Maxspect Jump MJ-GF316 Gyre — sister Jump-series gyre flow pump for the display.
• All saltwater supplies | AquaIllumination lighting

FAQ

Q: Will this work as a main reef tank light?
A: No. The MJ-L230R is purpose-built for refugium algae growth, not coral. For reef display lighting, consider an AquaIllumination Prime 16 HD or a Red Sea ReefLED G2 60.

Q: Why run it on a reverse cycle?
A: Macroalgae consume CO2 and produce O2 during daylight, which raises pH. Running the refugium light at night offsets the natural pH drop that happens when display photosynthesis stops, keeping pH stable around the clock.

Q: What kind of refugium does this fit?
A: The gooseneck clamp fits most sump-style refugium chambers and external display refugiums. Adjust the arm height to suit your chamber depth.

Q: Is it safe in a humid sump environment?
A: Yes — the MJ-L230R is built with sealed electronics and an aluminum heat sink suited to the humidity above an open sump.