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Free Shipping on most orders over $175 | Sales Tax in NJ only

Adjustable Spectrum Grow Lights

Tunable spectrum LED grow lights let growers fine-tune wavelength ratios for different stages of plant growth. Do you need more blue during vegetables to keep internodes tight? More red and far-red for explosive blooms? These grow lights let you dial in the ideal blend.

Spectrum plays a role in shaping plant height, leaf expansion, and pigment expression. Adjustable grow lights allow precise control in dynamic grow environments. Ideal for serious growers chasing optimal morphology and performance across a 2×2 to 5×5 ft space.

Grow smarter with bulk discounts and rebate opportunities only at Grow Light Central.

Angled view of Fluence SPYDR 2r LED grow light showing six aluminum light bars and attached central PSU.
Angled wide shot of SPYDR 2r showing eight active light bars and black power cord mounted to center heatsink.
$535.00 - $535.00
$535.00
$535.00 - $535.00
$535.00

Fluence SPYDR 2r LED Grow Light - 47" PhysioSpec Broad R4

Fluence

Achieve high-efficiency indoor growth with 1600 µmol/s output and full-spectrum control for premium bud cultivation. The Fluence SPYDR 2r LED Grow ...

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$535.00 - $535.00
$535.00
$535.00 - $535.00
$535.00

Frequently Asked Questions

Which adjustable LED grow lights are top-rated?

Look for spectrum-tunable LED lights that shift between Veg, Bloom, and Full Spectrum modes. Top units from brands such as Grand Master LEDs, GrowPro, and Scynce LED feature manual knobs or app control over blue, red, green, and far‑red channels, ensuring you only need one versatile fixture for all growth stage.

What are ideal preset recipes/settings for an adjustable grow light?

Use blue-heavy (~15–20% blue) in Veg mode to boost compact foliage; switch to Bloom/Flower mode rich in red (≥ 50%) with some far‑red to trigger flowering; full-spectrum white is great for transitions or mixed-phase grows.

How should I use adjustable spectrum grow lights effectively?

Hang lights at 24–36″ during Veg and 18–24″ during Flower (adjust per PPFD readings), choose Veg/Bloom presets or fine-tune channels, and match intensity to stage—e.g., dim during seedlings, ramp to full power in bloom.

Are there energy rebates or incentives for switching to adjustable-spectrum LED grow lights?

Yes! We offer a free eligibility check for rebates covering LED grow lights (including spectrum-tunable models), HVAC systems, and dehumidifiers.