In following CDC and WHO guidelines and out of an abundance of caution we are closed to in store sales or repairs. Please email and we will respond as quickly as possible. Please include your phone number if you would like a return call on the days I am not in the office. We have one person that will be shipping out orders on Monday and Thursday; otherwise we are hoping to resume our normal summer hours in mid-late May. Thank you for your understanding, stay well and have a sunny day!

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



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


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.

Download your Replacement Bulb Instructions:

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+.

Please open and inspect your package within 7 days of receipt. Items damaged after 7 days or damaged items not reported to the SunBox Company within 7 days of receipt are customer’s responsibility. 

201 Broadway street, Suite 220, Frederick, MD 21701 240-651-3286 1-800-548-3968