Update BulbRenderer.md

JujuAdams · Nov 6, 2023 · 9f0fe71 · 9f0fe71
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 |`.HARD_BM_MAX_SELFLIGHTING`|As above, but using `bm_max` to reduce bloom                                        |
 |`.SOFT_BM_ADD`             |Soft shadows using `bm_add`                                                         |
 
+!> `BULB_MODE.SOFT_BM_ADD` uses up a lot of GPU bandwidth. Lower-end GPUs may become saturated and struggle to keep a consistent framerate. Make sure to test thoroughly and offer graphics options if you're using this rendering mode.
+
 &nbsp;
 
 ## Member Variables