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FBO31/850K Replacement bulbs for SunRay, SunRay II and SunSquare


This is the replacement bulb for all SunRay, SunRay II, and SunSquare light boxes. Sold in packs of 4 or 6.

Download your Replacement Bulb Instructions:

SunBox now offers new energy-efficient 10,000 lux bright light bulbs. Low mercury technology means less mercury and a environmentally safer bulb.

These new 850 bulbs provide a brighter white and higher color rendering over the 750 bulbs. This new technology makes this the perfect time to replace your old bulbs!

SunRays take 4 bulbs and SunSquares take 6 bulbs.

Please take advantage of the of the 20% discount off your bulb purchase today!

SKU: SB-594 Category:


  • Easy to Install
  • Replacement Bulbs: All bulbs for 110v-220v and world voltage units
  • Fits: SunRay, SunRay II, SunSquare+ models
  • Watts: 31 – 5000K
  • Dimensions: 23″ Length
  • Instructions: Order the 4-pack to replace all bulbs in your SunRay or SunRay II. Order the 6-pack to replace all bulbs in your SunSquare+.

Additional information

Weight 6 lbs
Dimensions 27 x 7 x 7 in

2 Year Money Back Guarantee (less shipping). Excludes breakage.